Brussels Sprouts Casserole

Why This Brussels Sprouts Casserole Deserves a Spot on Your Table

This Brussels Sprouts Casserole is the kind of dish that turns skeptics into fans. The sprouts get charred in bacon fat, then simmered in heavy cream with garlic and thyme before being topped with a crunchy panko-Parmesan crust. It’s rich, savory, and just a little tangy from lemon zest. Call it a gratin if you want, it’s still the same one-skillet comfort food that works for Thanksgiving or a random Tuesday.

Reasons to Love This Brussels Sprouts Casserole

• One skillet, minimal cleanup. Everything from bacon to baking happens in the same cast iron pan, so you spend less time washing dishes.
• Bacon and Gruyère do the heavy lifting. The smoky bacon fat flavors the sprouts, and the Gruyère melts into a creamy, nutty sauce that ties it all together.
• That panko topping stays crisp. A quick broil at the end gives the breadcrumbs a golden crunch that contrasts with the tender sprouts.

Key Ingredients for This Brussels Sprouts Casserole

• Brussels sprouts: Look for small to medium sprouts that are firm and bright green. Larger ones can be bitter and take longer to cook. Halve or quarter them so they’re roughly the same size for even charring.
• Gruyère: This cheese melts into a smooth, nutty sauce. If you can’t find it, use Swiss or fontina. Grate it yourself, pre-shredded cheese has starch that prevents smooth melting.
• Panko: Japanese breadcrumbs give a lighter, crunchier topping than regular breadcrumbs. The Parmesan and lemon zest mixed in add flavor and help the topping brown.

Kitchen Tools for Brussels Sprouts Casserole

• 10-inch cast iron skillet: Holds heat evenly and goes from stovetop to oven. If you don’t have cast iron, use any oven-safe skillet or a 2-quart baking dish, just note that the sprouts won’t char as well on the stovetop in a nonstick pan.
• Mixing bowl: For combining the panko topping.
• Paper towels: For draining the cooked bacon.

Tips for Making the Best Brussels Sprouts Casserole

Don’t rinse the sprouts after cutting them, any moisture will steam them instead of letting them char. Cook them in the hot bacon fat without stirring too often so they develop deep brown spots. That’s where the flavor lives.

When you add the heavy cream, keep the heat low and let it simmer just 1 to 2 minutes. If you boil it hard, the cream can separate. And don’t skip the lemon zest in the panko topping, it cuts through the richness and keeps every bite from feeling heavy.

How to Know When the Casserole Is Done

After 12 to 15 minutes in the oven, the casserole should be bubbly around the edges and the cheese fully melted. The sprouts should be tender but still have a little bite, test one with a fork. If it slides in easily, it’s ready. The broil step is quick, so watch it closely. Once the panko turns golden brown, pull it out immediately to avoid burning.

Brussels Sprouts Casserole Variations to Try

To make this vegetarian, skip the bacon and cook the sprouts in olive oil instead. You can also swap the Gruyère for Swiss or sharp cheddar, both melt well and add their own character. If you want more texture, stir in 1/2 cup of toasted walnuts or pecans along with the bacon. For a dairy-free version, use full-fat coconut cream in place of the heavy cream and a dairy-free cheese blend, though the texture will be slightly different.

What to Serve with Brussels Sprouts Casserole

This casserole is a natural side for roast turkey or a holiday ham. The creamy, cheesy sauce also pairs well with mashed potatoes, just spoon them next to each other on the plate. For a lighter contrast, add a crisp green salad with a simple vinaigrette. A sprinkle of fresh thyme or a little extra lemon zest on top before serving brightens the whole dish.

How to Freeze Brussels Sprouts Casserole

You can freeze this casserole either before or after baking. To freeze unbaked, assemble everything in the skillet (or a freezer-safe dish) but stop before the broil step. Cover tightly with foil and freeze for up to 3 months. To bake from frozen, add about 10 minutes to the oven time, then broil as directed. If freezing after baking, let the casserole cool completely, then wrap and freeze. Reheat in a 350°F oven until hot and bubbly, the panko topping will soften, so you may want to add a fresh sprinkle of panko and broil again.

Best Way to Reheat Leftover Brussels Sprouts Casserole

The oven is your best bet for reheating. Place the casserole in a 350°F oven for 10 to 15 minutes, or until heated through. If the panko topping has lost its crunch, switch to broil for the last minute or two. The microwave works in a pinch, but the sprouts will turn soft and the topping won’t crisp up. For individual servings, an air fryer at 350°F for 3 to 4 minutes does a decent job restoring some crunch.

Brussels Sprouts Casserole FAQs