Name: Cheesy Brussels Sprout Casserole
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Cuisine: American
Ingredients: 2 pounds Brussels sprouts; ¼ cup unsalted butter; 1 medium yellow onion; 4 teaspoons garlic; ½ teaspoon crushed red pepper flakes; ¼ cup all-purpose flour; 1 cup chicken broth; 1 cup heavy whipping cream; 1 teaspoon kosher salt; ½ teaspoon black pepper; 1 cup gruyère cheese; 1 cup freshly grated parmesan cheese; 1 ½ cups crispy fried onions; Fresh parsley, chopped

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The aroma of melting cheese and roasted Brussels sprouts wafts through the air, beckoning you into the kitchen. As the golden edges of the casserole bubble and sizzle, you can’t help but imagine the creamy texture and savory flavor that awaits. Each bite promises a delightful crunch balanced with a rich, cheesy goodness that both comforts and excites the palate. This Cheesy Brussels Sprout Casserole is more than just a side dish; it’s a perfect centerpiece for any gathering, especially as autumn rolls in and we gather with loved ones for Thanksgiving or cozy dinners.

Table of Contents

Why You’ll Love This Recipe
Ingredients You’ll Need
How to Make Cheesy Brussels Sprout Casserole
Storing & Reheating
Chef’s Helpful Tips
Recipe FAQs
Cheesy Brussels Sprout Casserole

I vividly recall the first time I tasted this delightful dish at a potluck dinner, where friends and family came together to share their favorite recipes. The moment I took a bite, I was transported back to childhood memories of savory comfort foods. Now, I can’t resist making it for holidays and family gatherings. This is the kind of recipe that not only fills your belly but warms your heart, too. Let’s whip up this impressive yet simple Cheesy Brussels Sprout Casserole together. Your taste buds will thank you!

Why You’ll Love This Recipe

Simple & Quick: In just about an hour, this dish transforms fresh Brussels sprouts into a creamy, cheesy delight!
Irresistible Flavor: Each bite bursts with a savory blend of cheese and spices, with a hint of crispiness from the fried onions.
Eye-Catching Appeal: The vibrant color of the Brussels sprouts against the melt-in-your-mouth cheese makes this casserole a showstopper at any table.
Flexible Serving: Whether it’s a festive side for Thanksgiving or a comforting weeknight dinner, this casserole fits right in.
Diet-Friendly Options: Looking for alternatives? You can use plant-based milks or gluten-free flour to make it suitable for more diets.

Ingredients You’ll Need

2 pounds Brussels sprouts: Choose fresh, vibrant green sprouts for a tender texture. Frozen sprouts can work in a pinch, but fresh are best!
¼ cup unsalted butter: This adds a rich, creamy base to the casserole but can be replaced with olive oil for a lighter option.
1 medium yellow onion: Finely diced, onions impart sweetness and depth; shallots make a lovely alternative as well.
4 teaspoons garlic: Fresh minced garlic infuses the dish with flavor; pre-minced versions will do if you’re short on time.
½ teaspoon crushed red pepper flakes: This brings a gentle heat; adjust to taste or skip it for a milder version.
¼ cup all-purpose flour: Helps thicken the sauce, but feel free to use cornstarch for a gluten-free option.
1 cup chicken broth: Homemade or store-bought, this adds richness; vegetable broth is a great substitution for a vegetarian dish.
1 cup heavy whipping cream: For an indulgent texture, but you can swap it with half-and-half or a non-dairy cream for lighter or vegan versions.
1 teaspoon kosher salt: Essential for bringing out flavors; be cautious with table salt as it’s saltier.
½ teaspoon black pepper: Freshly ground is preferred for the best flavor.
1 cup gruyère cheese: Its nuttiness complements the Brussels sprouts wonderfully; feel free to use a mix of cheeses like cheddar for variety.
1 cup freshly grated parmesan cheese: Adds a savory, umami kick; pre-grated can be more convenient, but grating your own yields better texture.
1 ½ cups crispy fried onions: These give a delightful crunch! French’s brand works well, or you can make homemade ones.
Fresh parsley, chopped: A sprinkle on top before serving adds color and a fresh note.

How to Make Cheesy Brussels Sprout Casserole

Preheat and Prepare: Begin by preheating your oven to 375°F (190°C). While the oven heats, prepare your Brussels sprouts by washing, trimming, and halving them. This makes them easier to roast, and you want them to cook evenly and soak up all those flavorful juices. Grab a 9×13-inch baking dish and set it aside; we’ll be filling it with deliciousness shortly!

Sauté Aromatics: In a large skillet, melt the unsalted butter over medium heat. Add in the finely diced onion and sauté for about 5-7 minutes until they are soft and translucent. Aromatic onions are crucial for depth of flavor, and you’ll know they’re ready when they’ve turned golden and fragrant. Stir in the minced garlic and crushed red pepper flakes, cooking for another minute until your kitchen smells heavenly!

Add Flour and Liquid: Sprinkle the all-purpose flour over your onion and garlic mixture. Stir it constantly for about 1 minute to create a roux, which will help thicken the casserole. Gradually pour in the chicken broth, whisking continuously to avoid lumps. Then add the heavy whipping cream, kosher salt, and black pepper. Cook for 3-4 minutes until the sauce has thickened slightly and becomes smooth. This creamy layer is the heart of your Cheesy Brussels Sprout Casserole!

Toss with Cheese: Remove the skillet from the heat and fold in the gruyère and parmesan cheeses. This is where the magic happens—watch as those cheeses melt beautifully into the sauce, creating a delightful gooey coating. Toss the halved Brussels sprouts into the skillet, making sure they are coated evenly in that cheesy goodness. Feel free to taste along the way—it’s hard to resist!

Transfer and Top: Pour the cheesy Brussels sprouts mixture into the prepared baking dish, spreading it out evenly. Now, for the grand finale: sprinkle the crispy fried onions generously over the top. This will give your casserole that desirable crunch and golden finish! Your dish is now ready for baking.

Bake Until Golden: Transfer the dish to the preheated oven and bake for 30-35 minutes. You’ll know it’s done when the edges bubble and the top is golden brown. Keep an eye on it to prevent burning, and when it looks perfectly crisped, take it out and allow it to cool for a few minutes. The excitement of that savory aroma is simply irresistible!

Storing & Reheating

This Cheesy Brussels Sprout Casserole can be a fantastic make-ahead option. Leftovers can be stored at room temperature for a couple of hours, but for long-term storage, refrigerate in an airtight container for up to four days. If you want to freeze it, make sure it cools completely first. Store in a freezer-safe container for up to three months. Reheat in the oven at 350°F (175°C) for about 20-25 minutes until warmed through. Expect a slight change in texture after freezing, but a sprinkle of fresh breadcrumbs before reheating can help refresh that crispy top!

Chef’s Helpful Tips

Avoid overcooking the Brussels sprouts during the sauté process. You want them to remain slightly crisp since they will continue cooking in the oven.
For a creamier texture, let the casserole cool slightly before serving; it thickens as it sets.
If you love extra crunch, consider adding another layer of crispy fried onions halfway through baking.
Experiment with different cheeses! A combination of sharp cheddar and mozzarella can create a unique flavor.
For a lighter version, swap out the heavy cream for whole milk or a non-dairy alternative.

Brussels sprouts can often get a bad rap, but this casserole turns them into a comforting, cheesy delight that everyone will love.

Recipe FAQs

Can I use frozen Brussels sprouts?

Absolutely! Frozen Brussels sprouts can be a convenience, but make sure you thaw and drain them thoroughly before using. This avoids excess moisture that can make your casserole soggy. Just remember, fresh usually has a more vibrant flavor and texture!

Can I make this casserole vegetarian?

Yes, simply substitute the chicken broth with vegetable broth to keep the dish vegetarian. The rich flavors of the cheese and veggies will still shine through beautifully without the meat!

How do I make this casserole ahead of time?

To prepare in advance, assemble the casserole up to the baking point, cover, and refrigerate. When ready to bake, add about 10-15 minutes to your baking time since it will be cold.

What other toppings can I use besides fried onions?

Feel free to get creative! Toppings like breadcrumbs mixed with parmesan, sautéed mushrooms, or even a sprinkle of bacon bits can take this casserole to a whole new level. Just make sure they complement the rich flavors of the dish.

This Cheesy Brussels Sprout Casserole is sure to steal the spotlight at any gathering. With its creamy cheese, tender sprouts, and crispy topping, each bite is a reminder of the joys of comfort food. So go ahead and gather your loved ones—this recipe is one to be shared and cherished!