Sausage and Brussels Sprouts Casserole Recipe
If you’re searching for a comforting, hearty dish that’s packed with flavor and just the right touch of indulgence, this Sausage and Brussels Sprouts Casserole Recipe is an absolute game-changer. It brings together savory Italian sausage and tender Brussels sprouts in a creamy, cheesy bake that’s perfect for cozy dinners or impressing guests without a fuss. Every bite offers a beautiful balance of crisp-tender veggies and melty cheeses, making this casserole a favorite to return to time and again.

Ingredients You’ll Need
Simple, straightforward, and utterly essential—these ingredients come together to craft flavors that complement each other perfectly. Each one adds texture, richness, or brightness to ensure your casserole is nothing short of incredible.
- 1 lb Italian sausage (mild or spicy): The star protein that delivers bold, savory goodness.
- 1 lb Brussels sprouts, trimmed and halved: Adds a satisfying crunch and earthy flavor.
- 1 tablespoon olive oil: Helps sauté veggies to golden perfection.
- 1/2 teaspoon garlic powder: Enhances savory depth with subtle warmth.
- Salt and black pepper, to taste: Essential seasoning to brighten and balance flavors.
- 1/2 cup yellow onion, diced: Provides a sweet, aromatic base for the dish.
- 2 cloves garlic, minced: Infuses the casserole with that irresistible garlic punch.
- 1/2 cup chicken broth: Adds moisture and a light savory note to keep things juicy.
- 1/2 cup heavy cream or half-and-half: Creates a rich, velvety sauce binding the ingredients beautifully.
- 1 cup shredded mozzarella cheese: Offers meltiness and gooey, stringy delight.
- 1/2 cup shredded Parmesan cheese: Brings sharp, nutty flavor and helps develop a golden crust.
- 1/2 teaspoon crushed red pepper flakes (optional): Adds a gentle kick for those who crave a little heat.
- Fresh thyme or parsley, for garnish: Brightens the finished dish with a pop of color and freshness.
How to Make Sausage and Brussels Sprouts Casserole Recipe
Step 1: Preheat and Prepare
Start by preheating your oven to 375°F (190°C), then lightly grease a 9×13-inch baking dish. This prep step ensures that your casserole won’t stick and will bake evenly, setting the stage for everything that follows.
Step 2: Cook the Sausage
In a large skillet over medium heat, cook the Italian sausage until it’s browned and fully cooked through. Breaking it up as you go ensures nice crumbles. Once done, remove it from the skillet and set it aside – this flavorful meat will be the rich heart of the casserole.
Step 3: Sauté the Veggies
Using the same skillet, add olive oil and sauté the diced onions and minced garlic until soft and fragrant. Toss in the halved Brussels sprouts, sprinkle with garlic powder, then season with salt and black pepper. Cook for about 5 to 7 minutes, letting the sprouts get slightly browned for that lovely nutty taste and texture.
Step 4: Deglaze and Build Flavor
Pour the chicken broth into the skillet, scraping the bottom to lift all those delicious browned bits. Allow it to cook for another 3 to 4 minutes so the liquid reduces slightly and intensifies the flavors.
Step 5: Combine and Assemble
Return the cooked sausage to the pan and stir in the heavy cream along with half of the shredded mozzarella and Parmesan cheeses. This creamy mixture is what brings all the ingredients together. Pour everything into the prepared baking dish and level it out evenly.
Step 6: Top and Bake
Sprinkle the remaining mozzarella and Parmesan cheeses evenly over the top, adding optional crushed red pepper flakes if you like a gentle heat. Bake, uncovered, for 20 to 25 minutes, or until the casserole is bubbling and golden on top – that crispy cheese crust is pure magic.
Step 7: Garnish and Serve
Let the casserole cool for a few minutes before garnishing with fresh thyme or parsley. This final touch not only adds freshness but also makes your dish look vibrant and inviting. Serve warm and get ready for all the compliments!
How to Serve Sausage and Brussels Sprouts Casserole Recipe

Garnishes
Fresh herbs like thyme or parsley work wonders to brighten the casserole and add a lovely herbal aroma. A light sprinkle of crushed red pepper flakes can offer an extra pop for spice lovers. For a touch of elegance, a drizzle of high-quality olive oil just before serving elevates the dish beautifully.
Side Dishes
This casserole shines on its own but pairs wonderfully with simple sides like garlic bread for soaking up the creamy sauce, or a crisp green salad with a zesty vinaigrette to balance the richness. Roasted root vegetables or mashed potatoes can also complement the hearty flavors perfectly.
Creative Ways to Present
For casual family dinners, scoop servings into individual ramekins for delightful personal portions. During celebrations, serve it in a beautiful ceramic baking dish right from the oven to show off the golden cheese crust. Adding a colorful napkin and rustic wooden board beneath makes this dish an instant centerpiece.
Make Ahead and Storage
Storing Leftovers
After serving, let any leftovers cool to room temperature, then transfer them to an airtight container. Store in the refrigerator for up to 3 days. This makes for a quick and satisfying next-day meal or snack without losing any flavor.
Freezing
The casserole freezes well if you want to prepare in advance. Assemble the dish but do not bake, then wrap it tightly with plastic wrap followed by foil. Freeze for up to 2 months. When ready, thaw overnight in the refrigerator before baking as usual, adding a few extra minutes to the cooking time.
Reheating
To reheat, warm individual portions in the microwave or place the whole casserole in a preheated 350°F (175°C) oven, covered with foil, until heated through. Removing the foil in the last 5 minutes helps revive that melt-in-your-mouth cheesy crust.
FAQs
Can I use turkey sausage instead of Italian sausage?
Absolutely! Turkey sausage makes a leaner option and still provides great flavor. Just be mindful that turkey sausage might be less fatty, so consider a splash of olive oil when sautéing the vegetables to keep things moist.
Are frozen Brussels sprouts okay to use?
Yes, if fresh sprouts aren’t available, frozen Brussels sprouts can work. Make sure to thaw and drain them well before cooking to avoid extra wateriness in the casserole.
Is there a vegetarian version of this casserole?
Definitely! Substitute the sausage with plant-based sausage or mushrooms for an earthy bite. Using vegetable broth instead of chicken broth completes the vegetarian-friendly makeover.
Can I prepare this casserole in advance and bake it later?
Yes, you can assemble everything and store the unbaked casserole in the fridge for up to 24 hours before baking. This is perfect for busy days when you want to prep ahead and just pop it in the oven later.
What cheese works best if I don’t have mozzarella or Parmesan?
Cheeses like Fontina, Gruyere, or even sharp Cheddar are excellent substitutes. They melt well and add their own unique flavor profiles to the dish, keeping your casserole tasty and creamy.
Final Thoughts
This Sausage and Brussels Sprouts Casserole Recipe is truly one of those dishes that wins hearts with its simplicity and impressive depth of flavor. Whether you’re feeding family or friends, it’s a wonderful way to enjoy seasonal veggies with comforting sausage and indulgent cheese. Give it a try—you’re going to love how easy and satisfying it is to make!
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Sausage and Brussels Sprouts Casserole Recipe
- Total Time: 40 minutes
- Yield: 4 servings 1x
Description
This comforting Sausage and Brussels Sprouts Casserole combines savory Italian sausage with tender Brussels sprouts in a creamy cheesy sauce, baked to golden perfection. Ideal for a hearty family meal, this dish balances the flavors of garlic, onion, and cheese with a touch of spice from optional red pepper flakes.
Ingredients
Sausage and Vegetables
- 1 lb Italian sausage (mild or spicy), casing removed
- 1 lb Brussels sprouts, trimmed and halved
- 1 tablespoon olive oil
- 1/2 teaspoon garlic powder
- Salt and black pepper, to taste
- 1/2 cup yellow onion, diced
- 2 cloves garlic, minced
Liquids and Cheese
- 1/2 cup chicken broth
- 1/2 cup heavy cream or half-and-half
- 1 cup shredded mozzarella cheese
- 1/2 cup shredded Parmesan cheese
- 1/2 teaspoon crushed red pepper flakes (optional)
Garnish
- Fresh thyme or parsley, for garnish
Instructions
- Preheat Oven: Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish to prevent sticking.
- Cook Sausage: Heat a large skillet over medium heat and cook the Italian sausage, breaking it apart, until browned and fully cooked through. Remove the sausage from the skillet and set aside.
- Sauté Veggies: In the same skillet, add olive oil and sauté the diced onions and minced garlic until softened and fragrant. Add the halved Brussels sprouts along with garlic powder, salt, and black pepper. Continue to cook for 5 to 7 minutes until the sprouts are slightly browned and tender.
- Deglaze: Pour in the chicken broth to deglaze the skillet, scraping the browned bits off the bottom. Cook for another 3 to 4 minutes to reduce slightly and enhance the flavor.
- Combine & Assemble: Return the cooked sausage to the skillet. Stir in the heavy cream (or half-and-half) and half of the shredded mozzarella and Parmesan cheeses, mixing well to combine all ingredients. Transfer the mixture evenly into the prepared baking dish.
- Top & Bake: Sprinkle the remaining mozzarella and Parmesan cheese evenly over the casserole. Optionally add crushed red pepper flakes for extra heat. Bake uncovered in the preheated oven for 20 to 25 minutes or until the top is golden brown and bubbly.
- Garnish & Serve: Remove the casserole from the oven and allow it to cool slightly. Garnish with fresh thyme or parsley before serving warm for a delicious, hearty meal.
Notes
- You can use either mild or spicy Italian sausage depending on your heat preference.
- If you want a lighter version, substitute heavy cream with half-and-half or a lower-fat cream alternative.
- Brussels sprouts should be trimmed and halved for even cooking and tenderness.
- Make sure to deglaze the pan well for extra depth of flavor.
- Fresh herbs like thyme or parsley brighten the dish just before serving.
- Leftovers can be stored in the fridge for up to 3 days and reheated in the oven for best texture.
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Category: Casserole
- Method: Baking
- Cuisine: American