Easy Stuffed Italian Sausage Casserole is a comforting Italian sausage casserole recipe made with juicy sausages, mozzarella, onions, and marinara, delivering one-dish baking, melty cheesy filling, and family-friendly comfort flavor. The sausages are browned, stuffed with mozzarella, and baked in marinara sauce with sautéed onions until bubbling and rich, creating a hearty dinner that feels like classic Italian comfort food.
Love this recipe? Try our Sausage and Potato Sheet Pan, Skillet Sausage and Peppers with White Wine Sauce or Baked Ziti with Ground Beef.
Stuffed Italian Sausage Casserole at a Glance 🔎
- 🕒 Prep Time: 15 minutes
- ⏱️ Cook Time: 40 minutes
- 👥 Servings: 6
- 🔥 Cook Method: Oven baked casserole
- 🍽️ Cuisine (or General Category): Italian Comfort Food
- 👩🍳 Pair With: Garlic bread, Caesar salad, roasted broccoli
- ⭐ Difficulty Level: Easy
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We've made this stuffed sausage casserole for countless weeknight dinners, and our favorite way to serve it is with garlic bread to soak up the marinara. ~Jami
Jump to:
- Stuffed Italian Sausage Casserole at a Glance 🔎
- Why We Love This Recipe
- Key Ingredients
- Substitutions & Variations
- How to Make Easy Stuffed Italian Sausage Casserole
- Expert Tips for Success
- Storage
- Easy Stuffed Italian Sausage Casserole Recipe FAQs
- Related
- More Italian Recipes You'll Love ♥️
- 📖 Recipe
- 💬 Share Your Thoughts
Why We Love This Recipe
- Easy to Make: With simple ingredients and a quick prep time, this casserole is beginner-friendly.
- Family-Friendly: The combination of cheese, sausages, and marinara sauce is a hit with both kids and adults.
- Great for Entertaining: It's a crowd-pleaser that's easy to serve when guests are over.
- Customizable: You can easily swap ingredients to suit your dietary preferences or what you have on hand.
Key Ingredients
- Italian Sausages: Choose mild or spicy, depending on your taste preference. If you're feeling adventurous, a mix of both can give your casserole more depth.
- Mozzarella Cheese: Shredded mozzarella melts well, but using mozzarella sticks inside the sausages makes it easy!
- Marinara Sauce: A store-bought sauce will work great in this dish, but homemade marinara brings fresh flavor. Use your favorite!
- Onion: Sliced onions get sautéed and bring a slight sweetness to balance out the richness of the sausages and cheese.
- Italian Seasoning: A classic blend of herbs like oregano, basil, and thyme, which adds to the Italian flavors of the dish.
- Parmesan Cheese: Adds a salty, nutty layer of flavor when sprinkled on top.
- Red or White Wine: Used to deglaze the pan. Don't worry, the alcohol cooks off, leaving behind just the flavor.
- Fresh Basil: This is optional, but a garnish of fresh basil leaves right before serving brightens up the dish and adds flavor.
A full ingredient list with exact measurements can be found in the recipe card below.
Substitutions & Variations
- Sausages: Substitute chicken sausage or turkey sausage if you prefer a lighter option.
- Mozzarella: Use string cheese sticks.
- Spicy: Add crushed red pepper flakes or use spicy Italian sausages for more heat.
- Kid-Friendly: Use mild sausage and serve with pasta to appeal to younger palates.
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How to Make Easy Stuffed Italian Sausage Casserole
STEP ONE: Prepare the Sausages
Heat olive oil in a large skillet over medium heat. Sear the sausages on all sides until they are nicely browned, about 5 minutes.
Remove from the skillet and set them aside to cool slightly.
STEP TWO: Deglaze and Sauté
After removing the sausages, pour wine into the skillet to deglaze, scraping up the bits from the bottom of the pan.
Add the sliced onions and sauté them in the wine reduction for about 3-4 minutes until soft. Add minced garlic and stir until fragrant (about 30 seconds).
STEP THREE: Stuff the Sausages
Once the sausages are cool enough to handle, cut a slit lengthwise into each sausage and stuff with mozzarella cheese.
Lay a bed of the sautéed onions with the wine reduction in a casserole dish, then place the stuffed sausages on top. Sprinkle with Italian seasoning.
STEP FOUR: Bake and Finish
Pour marinara sauce over the sausages, making sure they are covered. Add Parmigiano Reggiano evenly over the top. Cover the dish with foil and bake at 375°F for 25 minutes.
Remove the foil and bake uncovered for another 10-15 minutes until the cheese is bubbly and the sausages are fully cooked. Garnish with fresh basil or Italian seasoning if desired.
Expert Tips for Success
👩🍳Jami's Pro Tips: Want to take this recipe to the next level? Check out my expert tips below for the best flavor, texture, and meal prep hacks!
❌ DO NOT Overcrowd the pan when searing the sausages; it helps them brown evenly.
✔️ DO Loosely tent the dish with foil during baking.
Storage
Store leftover stuffed sausage in an airtight container in the refrigerator for up to 3 days. For longer storage, allow the casserole to cool completely, then wrap tightly or place in a freezer-safe container and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating. To reheat, warm the casserole in a 350°F oven for about 15-20 minutes or until heated through, or heat individual portions in the microwave in short intervals until hot.
Easy Stuffed Italian Sausage Casserole Recipe FAQs
Yes, stuffed Italian sausage casserole can be made ahead of time. You can assemble the entire dish, including stuffing the sausages, layering the onions and marinara sauce, and placing everything in the casserole dish. Cover it tightly with foil and refrigerate for up to 24 hours. When you're ready to cook, simply bake it as directed in the recipe.
Stuffed Italian sausage casserole is great to pair with lighter sides. A simple green salad with a tangy balsamic vinaigrette helps cut through the richness of the sausages and cheese. Garlic bread or a rustic loaf of bread is perfect for soaking up the marinara sauce. If you're looking for a vegetable side, roasted asparagus or zucchini would complement the dish well.
Yes, stuffed Italian sausage casserole can be frozen for up to three months. To freeze, assemble the casserole without baking it. Cover it tightly with foil and freeze. When you're ready to cook, thaw the casserole overnight in the refrigerator. Once thawed, bake it as directed, keeping an eye on the internal temperature of the sausages to ensure they're fully cooked.
Related
- Easy Italian Fried Cheese Recipe
- Easy Instant Pot Italian Soup with Ground Beef and Italian Sausage
- Italian Sausage and Peppers Skillet with White Wine
More Italian Recipes You'll Love ♥️
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📖 Recipe
Easy Stuffed Italian Sausage Casserole
Equipment
- Large Skillet or Dutch Oven
- Foil
- Wooden spoon
- Sharp Knife
Ingredients
- 8 Italian sausages mild or spicy, depending on preference
- 8 ounces mozzarella cheese shredded or cut into sticks for stuffing
- 3 cups homemade marinara sauce or store-bought
- 1 tablespoon olive oil
- 1 medium onion sliced
- 1 teaspoon Italian seasoning
- ¼ cup freshly grated Parmigiano Reggiano
- ¼ cup dry red or white wine for deglazing
- fresh basil for garnish optional
Instructions
- Preheat the oven to 375°F (190°C).
- Heat the olive oil in a large skillet or Dutch Oven over medium heat. Season the Italian sausages lightly with salt and pepper, then sear them on all sides until browned, about 4-5 minutes. Transfer the sausages to a plate and set aside.
- Pour the wine into the same skillet to deglaze the pan, scraping up the browned bits with a wooden spoon. Add the sliced onion and cook in the wine reduction for 3-4 minutes until softened. Stir in the minced garlic and cook for about 30 seconds until fragrant.
- Spread the sautéed onions, garlic, and wine reduction evenly across the bottom of a casserole dish.
- Using a sharp knife, cut a lengthwise slit in each sausage without cutting all the way through. Stuff each sausage with mozzarella cheese and arrange them on top of the onion mixture.
- Sprinkle the Italian seasoning evenly over the sausages. Pour the marinara sauce over the entire dish, coating the sausages and onions.
- Sprinkle the grated Parmigiano Reggiano evenly over the top. Cover the casserole dish tightly with foil and bake for 25 minutes. Remove the foil and continue baking for 10-15 minutes, until the sausages reach 165°F internally and the sauce is bubbling.
- Let the casserole rest for about 5 minutes before serving. Garnish with fresh basil or an extra sprinkle of Italian seasoning, if desired.
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Notes
- Brown the sausages well before baking to build flavor.
- Use thick marinara sauce so the casserole stays rich instead of watery.
- Slice the sausage carefully so the mozzarella stays tucked inside.
- Let the casserole rest briefly after baking so the sauce settles.
Marilyn says
Dinner was delicious! Easy to prepare and I served it with pasta. Will be making it again. I loved how easy and fast it was, the onions and wine added so much flavor.
Jami Powell says
Marilyn, thank you so much for leaving a comment! We are so glad you enjoyed the recipe. Great idea pairing it with the pasta! 🍝 💛