Cheesy Collard Greens Gratin: A Southern-Inspired Baked Casserole

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Cheesy Collard Greens Gratin

Welcome to the ultimate comfort food crossover! Forget the watery, over-simmered collards you might remember this recipe transforms the classic Southern side dish into a luxurious, bubbly, and incredibly decadent casserole. Our Cheesy Collard Greens Gratin takes the earthy, slightly bitter bite of fresh collard greens and envelops them in a rich, creamy Béchamel sauce loaded with sharp cheddar and nutty Gruyère, all finished with a golden, crispy panko topping. This is not just a holiday side; it’s a show-stopping dish perfect for any dinner table. Get ready to convert even the most skeptical green-eaters!

The beauty of this Cheesy Collard Greens Gratin lies in its balance. We harness the robust texture of the collards, tenderizing them with savory aromatics and a hint of smoky paprika, before folding them into a sophisticated cheese sauce. The resulting bake is deeply flavorful, wonderfully textural, and delivers that signature ‘gratin’ crunch that makes casseroles so irresistible. Whether you are seeking a hearty side dish for Sunday dinner or looking to elevate your holiday menu, this recipe is a must-try. We’ve meticulously detailed every step to ensure your gratin is perfect creamy, cheesy, and never watery.

Prep Time: 30 minutes
Cook Time: 30 minutes
Servings: 8

Why You’ll Love This Cheesy Collard Greens Gratin Recipe

This isn’t just a recipe; it’s an experience. If you think collard greens are too strong or too challenging to cook properly, prepare to have your mind changed. The magic here is threefold: the careful preparation of the greens, the complexity of the two-cheese Béchamel, and the irresistible crispy crust. Once you try this Cheesy Collard Greens Gratin, it will undoubtedly become a highly requested item at your gatherings.

A Sophisticated Twist on Southern Comfort

Traditional Southern collards often rely heavily on bacon or ham hocks and long simmering times, which, while delicious, can sometimes result in a simple, brothy side. Our approach elevates the dish into a true gourmet casserole. By incorporating a classic French technique the Béchamel sauce we achieve a level of creamy richness that complements the robust collard flavor beautifully. The addition of dry mustard powder and nutmeg in the sauce adds depth and warmth, cutting through the richness perfectly.

The choice of cheese is also critical. We move beyond simple mozzarella and use sharp cheddar for that tangy punch and Gruyère for its savory, nutty notes and superior melting quality. This combination ensures the sauce is silky smooth and packed with complex cheese flavor. When this creamy mixture bakes, the edges bubble, and the aroma fills your kitchen with the smell of home-cooked goodness. It’s comforting, yet elegant enough for a special occasion. Imagine serving this alongside a classic Spanish dish like a savory Paella Mixta; the richness of the gratin offers a perfect counterpoint to the seafood and saffron.

The Perfect Texture Balance

Texture is everything in a great gratin. No one wants a mushy casserole. We ensure success by first cooking the collards until they are tender-crisp (not falling apart) and, critically, draining them thoroughly. This prevents the final dish from becoming watery. The creamy filling is contrasted sharply by the top layer: a buttery blend of panko breadcrumbs and Parmesan cheese. Panko is essential here because its large, airy flakes absorb less moisture than traditional breadcrumbs, guaranteeing an exceptional crunch that lasts right up until the last serving.

This dish is also wonderfully practical. Because it’s a baked casserole, it holds heat exceptionally well and can be prepared in advance (more on that later!). It’s also incredibly satisfying, providing a substantial side dish that feels like a meal in itself. If you’re looking for a new centerpiece side dish that combines deep Southern flavor with sophisticated preparation, this recipe for Cheesy Collard Greens Gratin is your answer.

Why You Should Try This Recipe Right Now

If your past experiences with collard greens have left you underwhelmed, or if you are simply looking for an innovative way to introduce more healthy greens into your diet, this recipe is the game-changer you need. The versatility and sheer deliciousness of this Cheesy Collard Greens Gratin make it a kitchen staple.

Crowd-Pleasing and Nutrient-Dense

Collard greens are famously packed with nutrients, including Vitamin K, Vitamin A, and fiber. However, getting your family excited about eating them can be a challenge. That’s where the cheese comes in! By embedding the greens in a creamy, savory sauce, you mask any lingering bitterness and transform the vegetable into a highly palatable form, one that even children often adore. This is the ultimate “sneaky healthy” dish.

Moreover, this gratin is a guaranteed crowd-pleaser. Casseroles have a nostalgic charm, and the sight of a bubbly, golden-brown baked dish emerging from the oven is universally appealing. It’s the ideal dish for potlucks, family reunions, and holiday feasts. Unlike more delicate side dishes, the gratin is robust and travels well. It scales easily, too; simply use a larger pan and increase the proportions if you are cooking for a huge crowd.

The Secret is in the Flavor Layers

What sets this recipe apart from a simple cheese sauce and greens is the meticulous layering of flavor before the bake. We don’t rely solely on the cheese. Instead, the collards themselves are seasoned with a beautiful foundation:

  • Smoked Paprika: This adds a deep, savory, smoky undertone traditionally associated with cured meats in Southern cooking, without needing actual ham hocks (though you could certainly add them!).
  • Red Pepper Flakes: A touch of heat balances the richness of the cheese, ensuring the dish doesn’t feel heavy or cloying.
  • Aromatics: The finely diced onion and minced garlic are sautéed properly, building a sweet, savory base that permeates the greens as they simmer.

These initial steps are crucial for ensuring the collards are flavorful even before they meet the Béchamel. The resulting dish offers earthy greens, smoky spice, nutty cheese, and a luxurious creamy texture. It truly transforms the humble collard green into a star ingredient. For those who enjoy rich, savory side dishes, pair this with something lighter like a perfect Tortilla de Patatas for a balanced meal.

Ingredients and Necessary Utensils for the Ultimate Cheesy Collard Greens Gratin

Success in this recipe hinges on selecting quality ingredients, especially when it comes to the greens and the cheese. Using freshly grated cheese instead of pre-shredded will dramatically improve the texture and melt quality of your Béchamel.

The Essential Ingredients

Below is the detailed list of ingredients required. Remember, specific quantities matter in a Béchamel sauce, so measure accurately!

For the Collard Greens:

  • 2 large bunches (about 3 pounds) fresh collard greens: Look for firm, deep green leaves without yellowing or blemishes.
  • 2 tablespoons olive oil: For sautéing the aromatics.
  • 1 medium yellow onion, finely diced: The base flavor builder.
  • 4 cloves garlic, minced: Adds necessary pungency.
  • 1 cup chicken or vegetable broth (low sodium): Used for simmering the greens to tenderness.
  • 1/2 teaspoon smoked paprika: Provides the essential Southern smoky flavor.
  • 1/4 teaspoon red pepper flakes (optional, for heat): Adjust this amount based on your spice tolerance.
  • Salt and freshly ground black pepper, to taste: Seasoning is key at every step.

For the Cheese Sauce (Béchamel):

The Béchamel is the heart of this Cheesy Collard Greens Gratin. A true Béchamel requires a proper roux and warmed milk.

  • 4 tablespoons unsalted butter: Forms the base of the roux.
  • 1/4 cup all-purpose flour: The thickener.
  • 3 cups whole milk, warmed: Warming the milk prevents lumps when adding it to the roux and keeps the sauce smooth.
  • 1/4 teaspoon ground nutmeg: A mandatory, traditional seasoning for Béchamel that enhances the creaminess and flavor of the cheese.
  • 1 teaspoon dry mustard powder: This is a secret weapon that intensifies the cheddar flavor without adding any mustard taste.
  • 1 cup sharp cheddar cheese, freshly grated: For that classic, tangy cheese flavor (we reserve 1/2 cup for the topping).
  • 1 cup Gruyère or Monterey Jack cheese, freshly grated: Gruyère adds a sophisticated, nutty depth; Monterey Jack offers superb meltiness if Gruyère is unavailable.

For the Crispy Topping:

This topping provides the crucial textural contrast that elevates the gratin.

  • 1 cup panko breadcrumbs: Panko is paramount for maximum crunch.
  • 2 tablespoons unsalted butter, melted: To bind and toast the breadcrumbs.
  • 1/2 cup reserved grated sharp cheddar cheese: To melt into the topping.
  • 1/4 cup grated Parmesan cheese: For extra saltiness and savory depth.

Recommended Tools and Utensils

Having the right kitchen equipment makes the process of preparing this Cheesy Collard Greens Gratin much smoother and guarantees professional results.

Essential Cooking Tools:

  • Large Dutch Oven or Deep Skillet: Necessary for cooking down the large volume of raw collard greens.
  • 9×13 Inch Baking Dish: The standard size for this serving amount.
  • Medium Saucepan: Specifically for preparing the Béchamel sauce.
  • Sturdy Whisk: Essential for making a lump-free roux and Béchamel.
  • Sharp Knife and Cutting Board: For preparing the collards, especially for the chiffonade technique.
  • Colander: Absolutely necessary for draining the cooked collard greens completely.
  • Box Grater or Food Processor: Highly recommended for grating the sharp cheddar and Gruyère freshly. Pre-shredded cheese contains anti-caking agents that can make your sauce gritty.

By using these tools and prioritizing fresh ingredients, you set the stage for a spectacularly rich and creamy Cheesy Collard Greens Gratin that will impress any guest.

Detailed Recipe Steps: Creating the Perfect Casserole

Follow these steps methodically. The key to this dish is moisture control in the greens and proper technique for the Béchamel sauce.

Step 1: Prepare the Collard Greens (The Chiffonade)

Thoroughly wash the collard greens. Collards can hold a lot of grit, so wash them multiple times under cold running water. Strip the leaves from the thick central ribs. The ribs are tough and fibrous; remove them completely. Stack several leaves on top of one another, roll them tightly like a cigar, and slice them into thin ribbons (a chiffonade). This ensures the greens are tender and easier to manage in the casserole. Set the greens aside.

Step 2: Sauté the Aromatics and Cook the Greens

Preheat a large Dutch oven or deep skillet over medium heat and add the 2 tablespoons of olive oil. Add the diced yellow onion and sauté for 5 to 7 minutes until softened and translucent. This step sweetens the onion base.

Add the minced garlic and sauté for 1 minute until fragrant. Crucial Tip: Do not allow the garlic to brown, as burnt garlic will impart a bitter taste to the final dish. Add the prepared collard greens to the pan in batches, stirring until they wilt down slightly before adding the next batch. Pour in the broth, smoked paprika, and red pepper flakes (if using).

Cover the pan, reduce the heat to low, and simmer the greens for 15 to 20 minutes, or until tender.

Step 3: Drain the Greens (Critical Moisture Control)

Once cooked, DRAIN THE COLLARDS WELL. This is the single most important step to prevent a watery gratin. Transfer the cooked greens to a colander and press down gently with the back of a spoon to squeeze out excess liquid. You want them as dry as possible. Season the drained collards thoroughly with salt and pepper, then transfer the greens to a large mixing bowl.

Step 4: Prepare the Béchamel Cheese Sauce (The Foundation)

While the greens are simmering, prepare the sauce. Melt the 4 tablespoons of butter in a medium saucepan over medium heat. Whisk in the flour to create a smooth paste (a roux). Cook the roux, stirring constantly, for 1 to 2 minutes to cook out the raw flour flavor. The roux should smell slightly nutty, not raw.

Slowly whisk the warm milk into the roux, pouring in a steady stream to prevent lumps. Using warm milk is a professional trick to ensure a silky smooth sauce. Bring the sauce to a gentle simmer, whisking frequently until it thickens sufficiently to coat the back of a spoon (about 5 to 8 minutes). Reduce the heat to low.

Step 5: Finish the Sauce and Assemble the Gratin Base

Remove the saucepan from the heat. Stir in the nutmeg and dry mustard powder. Add the Gruyère and 1 cup of the sharp cheddar cheese (remember, the remaining 1/2 cup is for the topping). Stir until the cheeses are completely melted and the sauce is smooth and luxurious. Taste the sauce and adjust seasonings with salt and pepper as needed.

Pour about three-quarters of the cheese sauce over the drained collard greens in the mixing bowl and stir thoroughly to coat every piece of the greens evenly. The mixture should look incredibly rich and cohesive.

Step 6: Layer and Top the Gratin

Preheat the oven to 375°F (190°C). Lightly grease a 9×13 inch baking dish. Spread the cheesy collard green mixture evenly into the prepared baking dish. Pour the remaining cheese sauce over the top of the greens to ensure maximum coverage.

In a small bowl, combine the panko breadcrumbs, 2 tablespoons of melted butter, the reserved 1/2 cup of sharp cheddar, and the grated Parmesan cheese. Toss the mixture until the breadcrumbs are lightly coated in the butter and cheese. Sprinkle this topping mixture evenly over the entire surface of the Cheesy Collard Greens Gratin.

Step 7: Bake and Serve

Place the gratin in the preheated oven and bake for 25 to 30 minutes, or until the sauce is bubbly around the edges and the breadcrumb topping is golden brown and crisp.

Remove the gratin from the oven and allow it to rest for 10 to 15 minutes before serving. This resting time is critical; it allows the sauce to set up, preventing the gratin from falling apart when scooped. Serve hot as an impressive side dish or a light main course. You can find more Southern comfort food ideas on our Pinterest page! Click here for more inspiration!

Tips, Tricks, and Delicious Variations

Mastering this Cheesy Collard Greens Gratin is easy with a few insider tips. Whether you need to accommodate dietary restrictions or simply want to try a different flavor profile, these variations ensure success every time.

Avoiding Common Gratin Mistakes

1. The Watery Gratin Nemesis: As mentioned in the instructions, the number one mistake is failing to drain the greens properly. Even after simmering, collards retain a significant amount of water. If you skip the draining step, the water will weep out during baking, diluting your beautiful cheese sauce. Use a colander and press firmly to extract as much moisture as possible.

2. Bitter Greens: If your collards taste too bitter, you might need to simmer them longer, or, if you are pressed for time, blanch them briefly in salted boiling water before the sautéing step. Adding a tiny pinch of sugar (less than 1/4 teaspoon) to the simmering liquid can also help neutralize bitterness.

3. Gritty Sauce: Always use freshly grated cheese for the Béchamel. Pre-shredded varieties contain cellulose powder (an anti-caking agent) that prevents them from melting smoothly, resulting in a slightly gritty texture.

Ingredient Alternatives and Dietary Swaps

Vegan Cheesy Collard Greens Gratin

Transforming this into a plant-based masterpiece is straightforward:

  • Butter: Substitute with a good quality vegan butter alternative.
  • Milk: Use unsweetened, unflavored oat milk or cashew milk. These tend to be the creamiest plant-based options.
  • Cheese: Replace the dairy cheeses with 2 cups of your favorite high-quality vegan cheese shreds (such as Violife or Daiya Cutting Board blend). Add a tablespoon of nutritional yeast for an extra “cheesy” boost to the sauce.

Gluten-Free Version

To make the gratin gluten-free, simply substitute the all-purpose flour in the roux with 2 tablespoons of cornstarch or potato starch, or use a gluten-free all-purpose flour blend designed for baking. Ensure your broth is also certified gluten-free.

Alternative Greens

While collards are traditional, this recipe works beautifully with other sturdy greens:

  • Kale: Use lacinato (dinosaur) kale. Follow the same chiffonade and simmering steps.
  • Mustard Greens: These are sharper than collards. You may want to slightly increase the simmering time or balance the flavor with a bit more broth and seasoning.
  • A Mixed Green Gratin: Use a combination of spinach, kale, and collards. If using spinach, skip the simmering; simply wilt it completely, squeeze out all moisture, and mix it into the sauce.

Flavor Boosters

To deepen the flavor of your Cheesy Collard Greens Gratin:

  1. Add Meat: Sauté 4 oz of diced bacon or pancetta before adding the onions, removing the rendered fat before continuing the recipe.
  2. Spice it Up: Increase the red pepper flakes or add a dash of hot sauce (like Texas Pete or Tabasco) to the cheese sauce.
  3. Nutty Depth: Incorporate 1/4 cup of toasted, chopped pecans or walnuts into the breadcrumb topping for a truly Southern flair.

Nutritional Values and Health Benefits

While the word ‘gratin’ often conjures images of heavy indulgence, this Cheesy Collard Greens Gratin actually delivers significant nutritional benefits, primarily derived from the star ingredient: collard greens. This dish offers a balanced profile of macronutrients, combining healthy fats, complex carbohydrates, protein, and an exceptional amount of micronutrients.

Collard Greens: A Nutritional Powerhouse

Collards belong to the Brassica family, making them closely related to kale and cabbage. Their nutritional profile is outstanding:

  • High in Vitamin K: Collard greens are one of the best sources of Vitamin K, essential for blood clotting and bone health. A single serving contributes significantly more than the daily requirement.
  • Rich in Vitamin A and C: These vitamins are powerful antioxidants, supporting immune function and eye health.
  • Excellent Source of Fiber: The high fiber content aids digestion, promotes satiety, and helps regulate blood sugar levels, mitigating the impact of the creamy sauce.

By cooking the collards in a flavorful broth and finishing them in a cheese sauce, we make these powerhouse greens incredibly appetizing, ensuring you get the benefits without sacrificing flavor.

Estimated Nutritional Breakdown (Per Serving, based on 8 servings)

Please note: These are estimates and will vary based on specific ingredient brands and quantities.

Nutrient Estimated Value
Calories ~400–450 kcal
Protein ~20–25 g
Total Fat ~30–35 g
Saturated Fat ~18–20 g
Carbohydrates ~15–20 g
Fiber ~4–6 g
Vitamin K Very High

Balancing Indulgence and Health

The fats and calories primarily come from the cheese and butter, which are essential for achieving the classic creamy texture of the gratin. The inclusion of whole milk provides calcium and protein, making this a satisfying and substantial side dish. When serving, consider portion sizes a smaller serving of this rich Cheesy Collard Greens Gratin goes a long way when paired with a lean protein source.

For a lighter meal, consider using 2% milk instead of whole milk, and reducing the amount of cheese in the Béchamel slightly, perhaps replacing half a cup of the Gruyère with part-skim ricotta cheese for creaminess without the added fat. However, for a truly decadent experience that satisfies that comfort food craving, stick to the whole milk and full-fat cheese specified in the recipe. The reward is well worth the occasional indulgence.

Frequently Asked Questions (FAQ)

FAQs about Cheesy Collard Greens Gratin

Can I make Cheesy Collard Greens Gratin ahead of time?

Absolutely. You can assemble the entire casserole, including the cheese and collard mixture and the creamy Béchamel, up to 24 hours in advance. Cover it tightly with plastic wrap and refrigerate. Add the crispy panko topping right before baking to ensure maximum crunch, then add about 10-15 minutes to the total baking time since you’ll be starting from cold.

Why are my collard greens bitter in the gratin?

Collard greens naturally contain bitter compounds. To minimize bitterness, ensure you simmer them fully for the recommended 15-20 minutes with the broth and seasonings. Some cooks also find that adding a tiny pinch of sugar or a splash of apple cider vinegar to the simmering liquid helps neutralize the flavor. The richness of the cheese sauce also helps balance any remaining bitterness.

What cheeses work best for collard greens casserole?

A combination of sharp, flavorful cheese and a good melting cheese is ideal. We use sharp cheddar for tang and Gruyère for its nutty flavor and exceptional melt. Other excellent options include smoked Gouda, fontina, or Monterey Jack. Always use freshly grated cheese for the smoothest possible sauce texture in your Cheesy Collard Greens Gratin.

How do I prevent a watery collard greens gratin?

Preventing wateriness is vital for a successful gratin. The secret is diligent draining. After simmering the collard greens, transfer them to a colander and press down on them to expel all excess liquid. Any remaining moisture will release during baking and ruin the creamy texture of the Béchamel.

Can I use frozen collard greens for this recipe?

Yes, you can use frozen collard greens, but you must thaw them completely and squeeze them absolutely dry before mixing them with the cheese sauce. Frozen greens are often pre-cooked, so you can skip the simmering step entirely. Ensure you still sauté the onion, garlic, and spices first, then combine the thawed, drained greens with the aromatics before mixing into the sauce.

What is the best way to reheat leftover Cheesy Collard Greens Gratin?

To reheat, cover the dish with foil and place it in a 350°F (175°C) oven for about 15-20 minutes, or until warmed through. Remove the foil for the last 5 minutes to crisp up the topping again. Avoid microwaving, as it tends to make the topping soggy and the sauce rubbery.

Conclusion: The Ultimate Southern Comfort Side

This recipe for Cheesy Collard Greens Gratin is truly a culinary transformation. By pairing the robust, earthy flavor of perfectly prepared collard greens with a sophisticated, three-cheese Béchamel and a golden panko crust, we have created a side dish that rises far above standard comfort fare. It honors the soul food tradition while embracing classic European baking techniques, resulting in a casserole that is deeply satisfying and endlessly adaptable.

We’ve walked through the essential steps, from the precision cutting of the collards (the chiffonade) to the vital technique of creating a smooth, lump-free roux, and the crucial step of draining the greens to guarantee a creamy, set final product. Remember that attention to detail, especially in seasoning the greens and using freshly grated cheese, makes all the difference in achieving this high-quality result. This gratin is substantial enough to anchor a holiday meal or simply elevate a weeknight dinner.

Whether you pair it with roasted chicken, holiday turkey, or even something lighter like our Zucchini and Tuna Lasagna, this Cheesy Collard Greens Gratin is destined to become a staple in your recipe rotation. Don’t be shy about trying the variations especially the vegan option to tailor this dish to any dietary need. Grab your ingredients, preheat your oven, and prepare to bake the most delicious, creamy, and crispy collard greens you have ever tasted. We encourage you to try this recipe and share your results! Let us know in the comments how this classic Southern favorite was received at your table!

Cheesy Collard Greens Gratin

CHEESY COLLARD GREENS GRATIN: A SOUTHERN-INSPIRED BAKED CASSEROLE

A luxurious twist on classic Southern greens, this baked casserole features tender collard greens simmered with aromatics, bound in a creamy, sharp three-cheese sauce, and finished with a crispy panko topping.
Prep Time 30 minutes
Cook Time 30 minutes
Total Time 1 hour
Servings: 8 servings
Course: Casserole, Side Dish
Cuisine: American, Southern
Calories: 430

Ingredients
  

For the Collard Greens
  • 2 large bunches (about 3 pounds) fresh collard greens
  • 2 tablespoons olive oil
  • 1 medium yellow onion finely diced
  • 4 cloves garlic minced
  • 1 cup chicken or vegetable broth low sodium
  • 1/2 teaspoon smoked paprika
  • 1/4 teaspoon red pepper flakes optional, for heat
  • Salt and freshly ground black pepper to taste
For the Cheese Sauce (Béchamel)
  • 4 tablespoons unsalted butter
  • 1/4 cup all-purpose flour
  • 3 cups whole milk warmed
  • 1/4 teaspoon ground nutmeg
  • 1 teaspoon dry mustard powder
  • 1 1/2 cups sharp cheddar cheese, freshly grated 1 cup for sauce, 1/2 cup reserved for topping
  • 1 cup Gruyère or Monterey Jack cheese, freshly grated
For the Crispy Topping
  • 1 cup panko breadcrumbs
  • 2 tablespoons unsalted butter, melted
  • 1/4 cup grated Parmesan cheese

Equipment

  • 9x13 inch baking dish
  • Large Dutch Oven or Deep Skillet
  • Medium saucepan
  • Mixing Bowls

Method
 

Prepare the Collard Greens
  1. Thoroughly wash the collard greens. Strip the leaves from the thick central ribs. Stack several leaves on top of one another, roll them tightly like a cigar, and slice them into thin ribbons (a chiffonade). Set the greens aside.
  2. Preheat a large Dutch oven or deep skillet over medium heat and add the 2 tablespoons of olive oil. Add the diced yellow onion and sauté for 5 to 7 minutes until softened and translucent. Add the minced garlic and sauté for 1 minute until fragrant. Do not allow the garlic to brown.
  3. Add the prepared collard greens to the pan in batches, stirring until they wilt down slightly before adding the next batch. Pour in the broth, smoked paprika, and red pepper flakes (if using). Cover the pan, reduce the heat to low, and simmer the greens for 15 to 20 minutes, or until tender.
  4. Once cooked, drain the collards well to remove excess liquid, ensuring they are as dry as possible. Season with salt and pepper, then transfer the greens to a large mixing bowl.
Prepare the Béchamel Cheese Sauce
  1. While the greens are simmering, prepare the sauce. Melt the 4 tablespoons of butter in a medium saucepan over medium heat. Whisk in the flour to create a smooth paste (a roux). Cook the roux, stirring constantly, for 1 to 2 minutes to cook out the raw flour flavor.
  2. Slowly whisk the warm milk into the roux, pouring in a steady stream to prevent lumps. Bring the sauce to a gentle simmer, whisking frequently until it thickens sufficiently to coat the back of a spoon (about 5 to 8 minutes). Reduce the heat to low.
  3. Remove the saucepan from the heat. Stir in the nutmeg and dry mustard. Add the Gruyère and 1 cup of the sharp cheddar cheese (reserving the remaining 1/2 cup for the topping). Stir until the cheeses are completely melted and the sauce is smooth. Taste the sauce and adjust seasonings with salt and pepper as needed.
Assemble and Bake the Gratin
  1. Pour about three-quarters of the cheese sauce over the drained collard greens in the mixing bowl and stir thoroughly to coat every piece of the greens evenly.
  2. Preheat the oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish. Spread the cheesy collard green mixture evenly into the prepared baking dish. Pour the remaining cheese sauce over the top of the greens.
  3. In a small bowl, combine the panko breadcrumbs, 2 tablespoons of melted butter, the reserved 1/2 cup of sharp cheddar, and the grated Parmesan cheese. Toss the mixture until the breadcrumbs are lightly coated in the butter and cheese. Sprinkle this topping mixture evenly over the entire surface of the collard greens.
  4. Place the gratin in the preheated oven and bake for 25 to 30 minutes, or until the sauce is bubbly around the edges and the breadcrumb topping is golden brown and crisp.
  5. Remove the gratin from the oven and allow it to rest for 10 to 15 minutes before serving. This resting time helps the gratin set up, making it easier to scoop and serve.

Notes

Ensure the collard greens are thoroughly drained after simmering; excess liquid will water down the cheese sauce. For an extra smoky flavor, you can sauté a slice of chopped bacon or ham hock alongside the onions and garlic, removing the meat before adding the broth.

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