Sausage and Peppers Spaghetti Squash

The first time I made this casserole, my kitchen smelled like an Italian grandmother had moved in for the afternoon. I had somehow accumulated three spaghetti squash from my CSA box and needed something comforting that wasn't yet another pasta dish.

My husband walked in mid-roast, nose twitching like a detective, and immediately asked when we'd ordered Italian takeout. The look on his face when I pulled that bubbling, golden dish out of the oven was pure magic.

Ingredients

• 1 large spaghetti squash: About 3 pounds will give you the perfect amount of noodles, and look for one with firm unblemished skin
• 1 red bell pepper and 1 yellow bell pepper: The duo creates both sweetness and visual appeal that makes the dish feel special
• 1 small yellow onion: Thinly sliced so it melts into the sausage mixture rather than staying chunky
• 2 cloves garlic: Minced fresh because garlic powder just can't compete with the real thing here
• 12 oz Italian sausage: I prefer mild, but hot will give you this lovely background warmth that builds
• 1 1/2 cups marinara sauce: Your favorite jarred brand works perfectly, or homemade if you're feeling ambitious
• 1 cup shredded mozzarella and 1/4 cup grated Parmesan: Split these in half so some melts into the filling and some creates that irresistible golden crust
• 2 tbsp olive oil: One for roasting the squash, one for sautéing the sausage and vegetables
• 1/2 tsp dried oregano and 1/2 tsp dried basil: These classic Italian herbs reinforce the sausage seasoning beautifully
• 1/4 tsp crushed red pepper flakes: Optional, but I always add them for that subtle hum of heat
• Salt and pepper: Season generously at each step, tasting as you go
• Fresh basil: For garnish, because that pop of green against the golden cheese makes everyone grab their phones

Instructions

Roast the Squash:

Preheat your oven to 400°F, then cut that spaghetti squash in half lengthwise and scoop out the seeds. Brush the cut sides with olive oil, season with salt and pepper, and place them cut-side down on a parchment-lined baking sheet. Roast for 35 to 40 minutes until tender enough that the strands pull away easily with a fork.

Cook the Sausage:

While the squash roasts, heat the remaining olive oil in a large skillet over medium heat. Add the sausage, breaking it up with a spoon as it browns, about 6 to 7 minutes until cooked through.

Add the Vegetables:

Toss in the onions and bell peppers, sautéing for 5 minutes until softened. Stir in the garlic, oregano, basil, and red pepper flakes, cooking for just 1 minute more until fragrant.

Simmer the Sauce:

Pour in the marinara sauce and let everything simmer together for 5 minutes. Remove from heat while you finish the squash.

Prepare the Squash:

Once the squash is cool enough to handle, use a fork to scrape the flesh into those amazing spaghetti-like strands. Discard the skins.

Assemble and Bake:

Reduce the oven temperature to 375°F. In a large bowl, combine the squash strands, sausage mixture, half the mozzarella, and half the Parmesan. Mix well, transfer to a greased 9x13-inch baking dish, and top with the remaining cheeses. Bake for 15 to 20 minutes until bubbly and golden.

Save to Pinterest

This became my go-to comfort food during a particularly stressful month at work. There was something therapeutic about scraping those squash strands and watching everything come together in one dish.

Make It Your Own

I've made this with spicy sausage when I wanted more kick, and swapped in ground turkey with extra Italian seasoning for a lighter version. The vegetable ratios are completely flexible too.

Time Saving Tricks

You can roast the squash up to two days ahead and keep the strands in the refrigerator. The sausage and vegetable mixture also reheats beautifully, so batch cooking makes weeknight dinners practically effortless.

Serving Suggestions

A simple green salad with balsamic vinaigrette cuts through the richness perfectly. Garlic bread would be traditional, but roasted broccoli or sautéed kale keeps it lighter while still feeling complete.

• Leftovers reheat surprisingly well for lunch the next day
• The casserole freezes beautifully for up to three months
• Top with extra fresh basil right before serving for maximum aroma

Save to Pinterest

This dish has that rare ability to feel both comforting and virtuous, exactly the kind of food I want to feed people I love.

Recipe FAQs

→ How do you properly roast spaghetti squash?

Cut the squash in half lengthwise, scoop out seeds, brush with olive oil, season with salt and pepper, and roast cut-side down at 400°F for 35-40 minutes until tender.

→ What sausage is best for this dish?

Italian sausage, either mild or spicy, works best. Removing the casings before cooking ensures even browning and mixing with the vegetables.

→ Can I make this gluten-free?

Yes, by using gluten-free marinara sauce and sausage, this dish is naturally gluten-free while maintaining rich flavors.

→ How do you create the spaghetti-like strands from the squash?

After roasting and cooling the squash, use a fork to scrape the flesh, which naturally separates into spaghetti-like strands perfect for baking.

→ What are good substitutions for sausage?

Plant-based sausage or sautéed mushrooms can replace the meat for vegetarian variations without sacrificing texture or flavor.

→ How is the dish seasoned for depth of flavor?

Fresh and dried herbs like oregano and basil, garlic, and optional crushed red pepper flakes add aromatic layers and a mild kick.