Description

The Mushroom Bolognese Spaghetti Squash Casserole is a cheesy, comforting, and wholesome vegetarian dish that’s gluten-free and low-carb. With a rich mushroom-based Bolognese sauce layered over roasted spaghetti squash and topped with three cheeses, this casserole is perfect for a cozy dinner or meal prep. It’s a flavorful twist on classic lasagna, combining healthful ingredients with indulgent textures.

Ingredients

Units Scale

For the Mushroom Bolognese Sauce:

2 tbsp olive oil
1/2 large onion, finely chopped
8 oz baby bella or crimini mushrooms, quartered
5 cloves garlic, minced
1 tsp rosemary (fresh or dried)
2 tsp dried oregano
2 tsp paprika
1/2 tsp red pepper flakes (optional)
1 tsp sea salt
1 (28 oz) can crushed tomatoes (undrained)
2 tbsp fresh basil, chopped

For the Spaghetti Squash Casserole:

1 large spaghetti squash, roasted
1 1/2 cups mozzarella cheese, grated
1/4 cup Parmesan cheese, grated
1/3 cup ricotta cheese

Cook Mode Prevent your screen from going dark

Instructions

Roast the Spaghetti Squash:
Preheat the oven and roast the spaghetti squash. Refer to preferred roasting methods or follow standard instructions.
Prepare the Mushroom Bolognese Sauce:
- Heat olive oil in a large sauté pan over medium heat. Add the chopped onion and sauté for 8 minutes until fragrant and softened.
- Stir in the mushrooms and garlic, cooking for 3–5 minutes. Add rosemary, oregano, paprika, red pepper flakes, and salt. Cook for 2 minutes.
- Add the crushed tomatoes and bring to a gentle boil. Lower the heat to a simmer, cover, and cook for 30 minutes (longer for deeper flavor). Uncover and simmer for 10 more minutes to thicken. Stir in basil and set aside.
Assemble the Casserole:
- Preheat the oven to 400°F and grease a 9-inch casserole dish.
- Spread the roasted spaghetti squash in the dish and season with sea salt.
- Pour the mushroom Bolognese sauce over the squash and layer with mozzarella, Parmesan, and ricotta cheeses.
Bake the Casserole:
Bake for 30–45 minutes on the center rack until the cheese is golden and the sauce bubbles. Allow the casserole to sit for 30 minutes before serving to let the flavors meld and excess liquid settle.

Category: Dinner