Spaghetti Squash Casserole with Marinara

Introduction

Spaghetti Squash Casserole with Marinara is a healthy, hearty, and comforting dish that transforms humble spaghetti squash into a flavorful, cheesy, and satisfying casserole. This recipe combines the light, tender strands of roasted spaghetti squash with rich marinara sauce, melted cheese, and optional vegetables or protein for a well-rounded, low-carb twist on classic pasta casseroles.

Perfect for weeknight dinners, meal prep, or family gatherings, this casserole is easy to make, packed with nutrients, and offers all the flavor of traditional baked pasta without the heavy carbs. The combination of sweet, roasted squash, savory marinara, and gooey melted cheese makes it a crowd-pleaser that everyone will love.

Why I Love This Recipe

• Healthy and satisfying: Uses spaghetti squash as a low-carb, nutrient-rich alternative to pasta.
• Flavorful layers: Sweet roasted squash pairs perfectly with savory marinara and melted cheese.
• Versatile: Easy to add vegetables, meats, or seasonings to suit your taste.
• Family-friendly: Loved by kids and adults alike, even those who usually prefer traditional pasta.
• Make-ahead friendly: Can be prepped in advance and baked when ready.

Why This is a Must-Try Dish

This dish is a must-try because it reimagines classic baked pasta in a healthier, vegetable-forward way without sacrificing flavor or comfort. It’s a perfect option for anyone seeking a delicious low-carb casserole, a vegetarian-friendly meal, or simply a new twist on a familiar classic. The roasted spaghetti squash adds a subtle sweetness, while the marinara sauce and cheese give the richness you crave in every bite.

Time, Servings & Nutrition

• Preparation Time: 20 minutes
• Cooking Time: 40–45 minutes
• Total Time: 60–65 minutes
• Servings: 4–6
• Calories (approx): 320 kcal per serving

Course: Main Course / Casserole
Cuisine: Italian / Comfort Food

Ingredients

Squash and Sauce:

• 1 medium spaghetti squash
• 2 cups marinara sauce (homemade or store-bought)
• 1 tbsp olive oil
• Salt and pepper, to taste
• 1 tsp dried Italian seasoning

Cheese Layer:

• 1 cup shredded mozzarella cheese
• ½ cup grated Parmesan cheese
• ½ cup ricotta cheese (optional for creaminess)

Optional Add-ins:

• 1 cup sautéed vegetables (bell peppers, mushrooms, zucchini)
• 1 cup cooked ground turkey or Italian sausage

Cooking Directions

1. Prepare Squash: Preheat oven to 400°F (200°C). Cut spaghetti squash in half lengthwise and scoop out seeds. Brush flesh with olive oil, season with salt and pepper. Roast cut-side down on a baking sheet for 35–40 minutes until tender.
2. Scrape Squash: Remove squash from oven and let cool slightly. Use a fork to scrape the flesh into strands. Set aside.
3. Prepare Marinara: In a skillet, heat marinara sauce and season with Italian seasoning, salt, and pepper. Stir in optional sautéed vegetables or cooked meat if using.
4. Assemble Casserole: Preheat oven to 375°F (190°C). In a greased 9×13-inch baking dish, layer half of the spaghetti squash, half of the marinara, half of the cheeses. Repeat with remaining squash, sauce, and cheeses.
5. Bake: Cover with foil and bake for 20 minutes. Remove foil and bake an additional 10–15 minutes until cheese is melted and bubbly.
6. Serve: Let casserole cool for 5 minutes before serving. Garnish with fresh basil or extra Parmesan if desired.

Step-by-Step Preparation Method

1. Preheat oven and roast spaghetti squash cut-side down with olive oil and seasonings.
2. Scrape squash into strands once tender.
3. Heat marinara sauce; add optional vegetables or protein.
4. Layer half of squash, sauce, and cheeses in greased baking dish.
5. Repeat layers with remaining ingredients.
6. Cover with foil; bake 20 minutes. Remove foil; bake 10–15 minutes until bubbly.
7. Cool slightly; garnish and serve hot.

How to Serve

• Serve as a main dish for a light, satisfying dinner.
• Pair with a green salad or garlic bread for a complete meal.
• Garnish with fresh basil, parsley, or red pepper flakes for color and flavor.

Recipe Tips

• Don’t overcook spaghetti squash; strands should be tender but slightly firm.
• Use a mix of cheeses for richer flavor and creamier texture.
• Add sautéed vegetables for extra nutrition and variety.
• Reserve some pasta water or sauce to loosen casserole if it seems dry.
• Make ahead by assembling casserole; cover and refrigerate up to 24 hours before baking.

Variations

• Vegetarian: Omit meat and add extra vegetables such as spinach, mushrooms, or zucchini.
• Protein-packed: Add cooked ground turkey, chicken, or Italian sausage.
• Cheese Lovers: Use fontina, provolone, or Gouda in addition to mozzarella.
• Spicy Kick: Add crushed red pepper flakes or spicy Italian sausage.
• Creamy Version: Stir in ricotta or a splash of heavy cream for a richer casserole.

Freezing and Storage

• Refrigerator: Store leftovers in an airtight container for up to 3 days.
• Freezer: Assemble unbaked casserole and freeze for up to 2 months. Thaw overnight before baking.
• Reheating: Bake covered at 350°F (175°C) for 15–20 minutes or microwave individual portions until heated through.

Special Equipment Needed

• Baking sheet for roasting squash
• 9×13-inch baking dish
• Skillet for marinara and optional vegetables/meat
• Fork for scraping spaghetti squash
• Knife and cutting board

FAQ

Q1: Can I use jarred marinara sauce?
Yes, high-quality store-bought marinara works perfectly.

Q2: Can I make this vegan?
Yes, use plant-based cheese or omit cheese entirely.

Q3: Can I prepare ahead of time?
Yes, roast squash and assemble casserole; refrigerate for up to 24 hours before baking.

Q4: Can I add meat?
Yes, cooked ground turkey, chicken, or Italian sausage can be added for extra protein.

Q5: How do I prevent the casserole from being watery?
Drain excess liquid from roasted squash and avoid over-saucing.

Conclusion

Spaghetti Squash Casserole with Marinara is a healthy, hearty, and flavorful alternative to traditional baked pasta. With tender roasted squash, savory marinara, and gooey melted cheese, it delivers comfort, nutrition, and satisfaction in every bite. Perfect for weeknight dinners, meal prep, or family gatherings, this casserole is easy to make, versatile, and a must-try for anyone seeking a delicious low-carb pasta alternative.