When the bacon comes out of the skillet, the drippings left behind are already doing useful work. I brown the chicken in that same pan, then give the Brussels sprouts time to pick up color before they go into the baking dish. That little bit of skillet cooking keeps the casserole from tasting like a pile of separate ingredients.
For this Chicken and Bacon Brussels Sprouts Casserole, I build a creamy cheddar sauce on the side and pour it over the browned chicken and sprouts. The sauce coats everything without drowning it, and the panko-Parmesan topping gives the surface a crisp, savory finish.
It’s a hearty one-dish dinner with tender chicken, browned sprouts, salty bacon, and enough golden topping to make every scoop worth reaching for.
Kitchen Note
Let the bacon cool before you crumble it. Warm bacon is greasy and harder to break into pieces, while cooled bacon stays easy to scatter through the casserole.
Save this Chicken and Bacon Brussels Sprouts Casserole for a dinner with browned sprouts, creamy cheddar sauce, and a crisp Parmesan-panko top.
Why the Cheddar Goes In After the Sauce Leaves the Heat
A cream sauce can turn grainy when cheese gets cooked over direct heat. Cheddar melts into a smoother sauce when I stir it in after taking the thickened mixture off the burner. The sauce is hot enough to melt the shreds, but it isn’t bubbling beneath them.
That order matters here because the sauce needs to be thick enough to cling to chicken and Brussels sprouts before it goes into the oven. Flour cooked briefly in butter gives the broth and cream a base that thickens as it simmers; the cheddar then adds body and sharpness without needing extra cooking. Dijon brings a small, bright note that keeps the creamy sauce from feeling heavy against the sprouts and bacon.
If the cheese sauce looks grainy, high heat is usually the culprit. Pull the saucepan completely off the burner before stirring in the cheddar, and keep stirring until the shreds disappear. You want a cohesive sauce that pours easily over the casserole, not a stretchy cheese mixture.
What Makes the Bacon, Sprouts, and Creamy Sauce Work Together
- Bacon — Thick, crisp pieces bring a salty, smoky bite and leave drippings for browning the other ingredients. Regular grocery-store bacon works well; the main cue is to cook it until crisp, not merely warmed through. Turkey bacon can stand in, but it leaves less fat and a milder bacon flavor behind.
- Chicken breasts — Boneless, skinless pieces cook quickly and are easy to portion throughout the casserole. Cut them into even pieces so they brown at a similar rate. Boneless, skinless thighs can replace the breasts; they bring a richer taste and may need a little longer in the skillet, so use the temperature cue rather than relying only on the clock.
- Brussels sprouts — Fresh sprouts hold their shape through the skillet cooking and oven bake. Look for firm sprouts with compact leaves, then trim the ends and halve them so their cut sides can brown. Frozen sprouts tend to release extra moisture and won’t brown in the same way.
- Sharp cheddar and heavy cream — Sharp cheddar gives the sauce a clear cheese flavor, while heavy cream keeps it rich and silky. A standard block of cheddar is fine; shredding it yourself helps it melt more smoothly than pre-shredded cheese. Lower-fat milk makes a thinner sauce, so I stick with heavy cream for this casserole.
- Panko — The large, airy crumbs make a lighter, crisper topping than fine breadcrumbs. If you need a gluten-free version, use gluten-free panko and a gluten-free flour blend designed to replace all-purpose flour one-for-one in the sauce.
Brown Each Layer Before the Casserole Goes in the Oven
Render the bacon, then brown the chicken
Heat the oven to 375°F and grease a 9×13-inch baking dish. Cook the bacon in a 12-inch skillet over medium heat until crisp, about 6 to 8 minutes, then transfer it to a paper towel-lined plate. Season the chicken with kosher salt and black pepper, add the vegetable oil to the skillet, and raise the heat to medium-high. Brown the chicken in batches for about 5 to 7 minutes per batch, until browned and 165°F in the thickest pieces, then transfer it to the baking dish.
Give the Brussels sprouts some color
Add the halved sprouts to the skillet and stir occasionally as they cook for 6 to 8 minutes. Look for browned patches and sprouts that are beginning to soften, not fully tender centers; they’ll finish cooking in the oven. Once the bacon is cool, crumble it and stir it into the baking dish with the chicken and sprouts. If you crowd the skillet with sprouts, they’ll soften before they have a chance to brown.
Thicken the sauce and melt in the cheddar
In a 2-quart saucepan over medium heat, melt the butter and cook the minced garlic for 30 seconds. Whisk in the flour and cook for 1 minute, then gradually whisk in the chicken broth, heavy cream, and Dijon mustard. Bring the sauce to a gentle simmer, whisking, and cook for 3 to 5 minutes until it thickens. Remove the pan from the heat and stir in the cheddar until melted.
Top and bake until bubbling
Pour the sauce over the chicken and sprouts, then stir gently so everything gets coated without breaking up the sprouts. Mix the panko, Parmesan, and melted butter in a small bowl and sprinkle the crumbs evenly over the surface. Bake uncovered for 20 to 25 minutes, until the casserole bubbles around the edges and the topping is golden brown. Let it rest for 5 minutes before serving so the sauce settles around the filling.
Two Simple Ways to Adapt This Chicken and Sprouts Bake
Make the casserole gluten-free
Replace the all-purpose flour with a gluten-free one-for-one flour blend and use gluten-free panko. The sauce may have a slightly different texture depending on the blend, but it will still thicken and coat the filling; the topping keeps its crisp contrast.
Trade cheddar for Gruyère
Use Gruyère in place of the sharp cheddar for a nuttier, less pointed cheese flavor. It melts into the cream sauce well, though the finished casserole will taste less tangy than the cheddar version.
Storage and Reheating
- Refrigerator: Keep leftovers covered in the refrigerator for 3 to 4 days. The topping softens as it sits against the sauce.
- Freezer: Freeze cooled portions in airtight containers for up to 2 months. The filling freezes well, but the crumb topping loses some crunch.
- Reheating: Warm portions covered in a 350°F oven until the center reaches 165°F, then uncover briefly to refresh the topping. The microwave works for a quick portion, but it softens the crumbs further.
Questions That Come Up Before the First Bite
Chicken and Bacon Brussels Sprouts Casserole
Ingredients
Equipment
Method
- Heat the oven to 375°F.
- Grease a 9x13-inch baking dish.
- In a 12-inch skillet over medium heat, cook the bacon until crisp, 6 to 8 minutes.
- Transfer the bacon to a paper towel-lined plate, crumble it when cool, and leave the drippings in the skillet.
- Season the chicken with the salt and pepper.
- Add the oil to the skillet and raise the heat to medium-high.
- Cook the chicken in batches until browned and 165°F in the thickest pieces, about 5 to 7 minutes per batch.
- Transfer the chicken to the baking dish.
- Add the Brussels sprouts to the skillet and cook, stirring occasionally, until browned and beginning to soften, 6 to 8 minutes.
- Transfer the Brussels sprouts to the baking dish and stir in the crumbled bacon.
- In a 2-quart saucepan over medium heat, melt the butter and cook the garlic for 30 seconds.
- Whisk in the flour and cook for 1 minute.
- Gradually whisk in the broth, cream, and Dijon mustard.
- Bring the sauce to a gentle simmer, whisking, and cook until thickened, 3 to 5 minutes.
- Remove the sauce from the heat and stir in the cheddar until melted.
- Pour the sauce over the chicken and Brussels sprouts and stir gently to coat.
- In a small bowl, mix the panko, Parmesan, and melted butter.
- Sprinkle the topping evenly over the casserole.
- Bake uncovered until bubbling around the edges and the topping is golden brown, 20 to 25 minutes.
- Let rest for 5 minutes before serving.