Perfect Sausage and Peppers Spaghetti Squash Casserole

This sausage and peppers spaghetti squash casserole is a hearty, flavorful, and wholesome meal that transforms simple ingredients into a family-friendly dinner. Not only does it combine the savory goodness of Italian sausage with the freshness of bell peppers and the light texture of spaghetti squash, but it also creates a low-carb alternative to traditional pasta dishes. Whether you’re following a gluten-free lifestyle or just looking for new ways to enjoy squash, this casserole brings comfort and nutrition together beautifully.

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Why This Casserole Deserves a Spot on Your Menu

There are plenty of casserole recipes out there, but this one stands out for several good reasons. Firstly, it incorporates roasted spaghetti squash, which offers a tender, pasta-like consistency without the added carbs. Secondly, the mixture of sausage and peppers is reminiscent of classic Italian street food, giving this casserole a familiar and crave-worthy flavor. Moreover, the cheese topping provides that satisfying, gooey finish that brings everything together. With minimal effort, you’ll have a meal that feels indulgent but is surprisingly nutritious.

If you’re a fan of squash-based dishes, you might also enjoy this delightful sausage-stuffed acorn squash which offers similar comforting flavors.

Ingredients Breakdown

To make this sausage and peppers spaghetti squash casserole, gather the following ingredients:

• 1 large spaghetti squash
• 1 pound Italian sausage (mild or hot)
• 1 large bell pepper (any color)
• 1 large onion
• 2 cloves garlic, minced
• 1 can (14.5 oz) diced tomatoes (with juices)
• 1 teaspoon Italian seasoning
• 1 teaspoon red pepper flakes (optional)
• 1 ½ cups shredded mozzarella cheese
• ½ cup grated Parmesan cheese
• Olive oil
• Salt and pepper, to taste
• Fresh basil for garnish (optional)

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How to Make Sausage and Peppers Spaghetti Squash Casserole

Step 1: Roast the Spaghetti Squash

Preheat your oven to 400°F (200°C). Cut the spaghetti squash in half lengthwise and scoop out the seeds. Drizzle the inside with olive oil and sprinkle with salt and pepper. Place the squash halves cut-side down on a baking sheet and roast for 30–35 minutes or until tender. Once cooled slightly, use a fork to scrape out the flesh into spaghetti-like strands.

Step 2: Brown the Sausage

In a large skillet over medium heat, cook the Italian sausage, breaking it up with a wooden spoon. Cook for 5–7 minutes or until it’s no longer pink. This step is crucial to building flavor, so allow the sausage to brown slightly for added richness.

Step 3: Add the Vegetables

Add chopped onions and bell peppers to the skillet with the sausage. Sauté for 3–5 minutes until the veggies begin to soften. Then, stir in the minced garlic and cook for another minute.

Step 4: Stir in Tomatoes and Seasonings

Pour in the diced tomatoes with their juices. Add Italian seasoning and red pepper flakes if using. Stir well to combine and let everything simmer for 3–4 minutes to allow the flavors to blend.

For those who enjoy flavor-packed veggie-forward meals, consider this roasted vegetable pasta as a great side or future dinner option.

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Step 5: Mix in the Squash

Add the roasted spaghetti squash strands to the skillet and mix until evenly combined with the sausage and veggie mixture. Season with additional salt and pepper to taste.

Step 6: Assemble the Casserole

Transfer the mixture to a greased casserole dish. Top evenly with shredded mozzarella and grated Parmesan cheese. These cheeses will create a melty, golden crust that enhances the overall texture and appeal.

Step 7: Bake and Serve

Place the casserole in the oven and bake for 20–25 minutes or until the cheese is bubbly and golden. Once done, allow the casserole to rest for a few minutes before slicing and serving.

This hearty dish pairs wonderfully with a light side like fennel apple salad for a balanced meal.

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Variations and Customizations

This sausage and peppers spaghetti squash casserole is highly versatile, so feel free to make adjustments based on what you have on hand or your dietary preferences. For instance:

• Use ground turkey or chicken sausage as a leaner protein option.
• Swap mozzarella for provolone or fontina for a deeper cheese flavor.
• Add spinach or kale for extra greens.
• Include mushrooms for an earthy depth.

If you’re experimenting with fall flavors, try combining this casserole with a cozy creamy pumpkin pasta.

Tips for Success

• Choose a firm spaghetti squash without soft spots for best results.
• Use freshly shredded cheese—it melts better than pre-shredded.
• Allow the squash to cool slightly before handling to avoid burns.

Make-Ahead and Storage

This sausage and peppers spaghetti squash casserole is perfect for meal prep. You can prepare the sausage and squash mixture ahead of time, refrigerate it, and assemble it just before baking. Once cooked, leftovers keep well in an airtight container in the fridge for up to 4 days. Reheat in the oven or microwave until warmed through.

Looking for more savory, cozy casseroles? This hamburger supreme casserole might be another perfect addition to your dinner table.

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Nutritional Benefits

sausage and peppers spaghetti squash casserole is naturally low in calories and carbohydrates, making it an excellent substitute for pasta in casseroles. It’s also high in fiber, vitamin C, and antioxidants. When combined with lean protein and veggies, it forms a complete and satisfying meal.

What to Serve Alongside

Consider serving this sausage and peppers spaghetti squash casserole with:

• A fresh green salad with classic creamy Italian salad dressing
• Garlic bread or roasted vegetables
• A glass of red wine or sparkling water

Conclusion

This sausage and peppers spaghetti squash casserole recipe is more than just a low-carb alternative—it’s a flavor-packed, comforting meal that brings together the heartiness of sausage, the brightness of peppers, and the light, satisfying texture of squash. It’s the perfect dish for weeknights, meal prepping, or even casual dinner parties. With simple ingredients, easy steps, and plenty of room for customization, this casserole will quickly become a regular feature on your dinner menu.

And if you loved this sausage and peppers spaghetti squash casserole recipe, don’t miss our related favorites like rice and Italian sausage and creamy butternut squash gnocchi with sausage. They all make use of similar ingredients with equally delicious results.

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Sausage and Peppers Spaghetti Squash Casserole

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• Author: Elisa
• Total Time: 1 hour 15 minutes
• Yield: 6 1x
• Diet: Gluten Free

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Description

This sausage and peppers spaghetti squash casserole is a comforting, low-carb dinner made with roasted spaghetti squash, savory Italian sausage, sweet bell peppers, and a cheesy, bubbly topping. It delivers classic Italian-inspired flavor without the pasta.

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Ingredients

Scale 1x2x3x

• 1 large spaghetti squash
• 1 lb Italian sausage (mild or hot)
• 1 large bell pepper, chopped
• 1 large onion, chopped
• 2 cloves garlic, minced
• 1 can (14.5 oz) diced tomatoes, with juices
• 1 tsp Italian seasoning
• 1 tsp red pepper flakes (optional)
• 1 1/2 cups shredded mozzarella cheese
• 1/2 cup grated Parmesan cheese
• Olive oil, as needed
• Salt and black pepper, to taste
• Fresh basil, for garnish (optional)

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Instructions

1. Roast the Squash: Preheat oven to 400°F (200°C). Cut spaghetti squash in half lengthwise and remove seeds. Drizzle with olive oil, season with salt and pepper, and place cut-side down on a baking sheet. Roast for 30–35 minutes until tender. Let cool slightly, then scrape into strands.
2. Cook the Sausage: In a large skillet over medium heat, cook Italian sausage, breaking it up, until browned and no longer pink (about 5–7 minutes).
3. Sauté Vegetables: Add chopped onion and bell pepper to the skillet. Cook for 3–5 minutes until softened. Stir in garlic and cook for 1 minute.
4. Add Tomatoes & Seasoning: Stir in diced tomatoes with juices, Italian seasoning, and red pepper flakes. Simmer for 3–4 minutes.
5. Combine Squash: Add spaghetti squash strands to the skillet and mix until evenly combined. Season with salt and pepper to taste.
6. Assemble: Transfer mixture to a greased casserole dish. Top with mozzarella and Parmesan cheese.
7. Bake: Bake for 20–25 minutes until cheese is melted and lightly golden.
8. Serve: Rest for a few minutes, garnish with fresh basil if desired, and serve warm.

Notes

• Protein swaps: Use turkey or chicken sausage for a lighter option.
• Cheese variations: Provolone or fontina work well instead of mozzarella.
• Add greens: Stir in spinach or kale before baking for extra nutrients.
• Make-ahead: Assemble up to 1 day ahead and bake when ready.
• Storage: Refrigerate leftovers up to 4 days; reheat in oven or microwave.

• Prep Time: 20 minutes
• Cook Time: 55 minutes
• Category: Dinner
• Method: Baked
• Cuisine: Italian-Inspired

Nutrition

• Serving Size: 1 serving