Spaghetti Squash Lasagna – A Cheesy, Comforting Low-Carb Lasagna Casserole with Roasted Spaghetti Squash, Rich Tomato Sauce, Ricotta, and Mozzarella

Spaghetti Squash Lasagna is a delicious twist on classic Italian-American lasagna that replaces traditional pasta sheets with tender, naturally stringy spaghetti squash. The squash strands provide a satisfying texture while absorbing the rich flavors of tomato sauce, herbs, creamy ricotta, and melted mozzarella. Finished with a golden layer of cheese, this comforting casserole is perfect for family dinners and cozy weekend meals.This recipe brings together the familiar flavors of traditional lasagna in a lighter vegetable-based format.

Spaghetti Squash Lasagna:

Roasted spaghetti squash develops a naturally sweet, slightly nutty flavor, while marinara sauce adds savory tomato richness. Creamy ricotta creates a soft, luxurious layer, and mozzarella melts beautifully over the top for that irresistible cheesy finish.Whether you are looking for a creative way to enjoy spaghetti squash, a vegetable-forward dinner, or simply a comforting baked casserole, this Spaghetti Squash Lasagna is an excellent choice. It can be prepared ahead of time, customized with meat or vegetables, and served with a crisp salad or warm garlic bread for a complete meal.

History:

Traditional lasagna has roots in Italy, particularly in regions such as Emilia-Romagna and Campania, where layered pasta, sauce, cheese, and other fillings have been enjoyed for generations. The modern lasagna familiar in many American households often features tomato sauce, ricotta or other cheeses, ground meat, and mozzarella.

Spaghetti squash, meanwhile, became popular as a versatile vegetable substitute for pasta because its cooked flesh naturally separates into long strands. Combining it with the flavors and layering style of lasagna is a modern interpretation rather than a traditional Italian preparation. Spaghetti Squash Lasagna reflects the broader trend of adapting classic comfort foods around vegetables while preserving their familiar flavors.

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Spaghetti Squash Lasagna

Shruthi

Tender roasted spaghetti squash replaces traditional lasagna noodles in this comforting casserole.Rich marinara sauce adds a savory tomato base with Italian-inspired herbs.Creamy ricotta creates a deliciously soft and cheesy middle layer.Mozzarella melts over the top for a golden, bubbling finish.The casserole is easy to customize with meat, vegetables, or extra cheese.It is a satisfying family-friendly dinner for weeknights or cozy gatherings.

Print Recipe

Prep Time 20 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 15 minutes mins

Course Main Course

Cuisine American, Italian-Inspired

Servings 4

Calories 430 kcal

Ingredients

  

For the Spaghetti Squash

• 1 large spaghetti squash, about 3–4 pounds
• 1 tablespoon olive oil
• ½ teaspoon salt
• ¼ teaspoon black pepper

For the Tomato Sauce

• 3 cups marinara sauce
• 2 cloves garlic, minced
• 1 teaspoon Italian seasoning
• ½ teaspoon dried basil
• Salt and black pepper, to taste

For the Ricotta Filling

• 1½ cups ricotta cheese
• ½ cup grated Parmesan cheese
• 1 large egg
• 1 tablespoon chopped fresh parsley or basil
• ½ teaspoon Italian seasoning
• ¼ teaspoon black pepper

For the Topping

• 1½ cups shredded mozzarella cheese
• ¼ cup grated Parmesan cheese
• 1 tablespoon chopped fresh basil or parsley

Instructions

 

Prepare the Spaghetti Squash

• Preheat your oven to 400°F (200°C).

  Carefully cut the spaghetti squash in half lengthwise. Scoop out the seeds and stringy center using a spoon.

  Brush the cut sides with olive oil and season with salt and black pepper. Place the squash cut-side down on a parchment-lined baking sheet.

  Roast for approximately 35–45 minutes, depending on the size of the squash. The flesh should be tender enough to pierce easily with a fork.

  Allow the squash to cool for several minutes, then use a fork to gently scrape the flesh into long strands. Set aside.

  While the squash is roasting, place the marinara sauce in a saucepan over medium-low heat.

Prepare the Tomato Sauce

• While the squash is roasting, place the marinara sauce in a saucepan over medium-low heat.

  Add minced garlic, Italian seasoning, dried basil, and red pepper flakes if using. Stir and simmer for approximately 8–10 minutes.

  Taste and adjust the seasoning with salt and black pepper.

  If you are adding ground beef or Italian sausage, brown the meat separately, drain excess fat, and stir it into the sauce.

Make the Ricotta Filling

• In a medium bowl, combine the ricotta, Parmesan, egg, parsley or basil, Italian seasoning, salt, and black pepper.

  Mix until smooth and well combined.

  The egg helps the ricotta mixture set slightly as the lasagna bakes, creating a creamy but structured layer.

Assemble the Lasagna

• Reduce the oven temperature to 375°F (190°C).

  Lightly grease a 9×13-inch baking dish.

  Spread a thin layer of marinara sauce over the bottom of the dish.

  Add approximately half of the spaghetti squash strands and gently spread them into an even layer.

  Spoon half of the ricotta mixture over the squash and spread carefully.

  Add another layer of marinara sauce followed by the remaining spaghetti squash.

Add the Cheese

• Sprinkle the shredded mozzarella evenly over the surface.

  Add the grated Parmesan for extra flavor and a beautiful golden crust.

Bake

• Cover the baking dish loosely with aluminum foil and bake for approximately 25 minutes.

  Remove the foil and continue baking for another 15–20 minutes, or until the cheese is melted, bubbling, and lightly golden.

  For a more deeply browned top, place the casserole under the broiler for 1–2 minutes, watching carefully so the cheese does not burn.

Rest and Serve

• Remove the lasagna from the oven and let it rest for 10–15 minutes before slicing.

  Garnish with fresh basil or parsley.

  Serve warm with a crisp green salad, roasted vegetables, or garlic bread.

Notes

• Squash size: A large spaghetti squash provides enough strands for a substantial casserole. Smaller squash may require two.
• Moisture: Spaghetti squash naturally contains a lot of water, so allow the roasted strands to cool and drain excess moisture if necessary.
• Sauce: Choose a thick marinara sauce to help prevent the finished casserole from becoming watery.
• Cheese: Whole-milk ricotta creates a particularly creamy filling, while part-skim ricotta can be used for a lighter version.
• Meat option: Cooked ground beef, Italian sausage, or ground turkey can be added to the tomato sauce.
• Vegetarian option: Keep the recipe meat-free or add spinach, mushrooms, zucchini, or bell peppers.
• Resting time: Letting the casserole rest before serving makes it easier to cut into neat portions.
• Storage: Refrigerate leftovers in an airtight container for up to 3–4 days.

 

Keyword baked vegetable casserole, Cheesy Spaghetti Squash, Healthy Lasagna, low-carb lasagna, Spaghetti Squash Lasagna, spaghetti squash recipe

Tips for Spaghetti Squash Lasagna:

• Roast rather than boil: Roasting concentrates the squash’s flavor and generally produces strands with less excess moisture.
• Do not overcook the squash: Very soft squash can become mushy in the casserole. Roast just until tender.
• Use thick sauce: A thicker marinara gives the lasagna a better structure and helps control moisture.
• Season every layer: Proper seasoning of the squash, ricotta, and sauce creates much better overall flavor.
• Avoid overloading with cheese: Too much cheese can make the casserole greasy and overpower the vegetables.
• Use fresh herbs: Fresh basil or parsley added after baking gives the dish a brighter finish.
• Broil carefully: If using the broiler, watch the casserole constantly because mozzarella can brown very quickly.
• Make it ahead: Assemble the casserole several hours in advance, refrigerate it, and bake when ready. Allow additional baking time if starting from cold.

FAQs for Spaghetti Squash Lasagna:

1. Can I make Spaghetti Squash Lasagna ahead of time?

Yes. Assemble the casserole, cover it, and refrigerate it for several hours before baking. It is convenient for meal preparation and entertaining.

2. Can I use leftover cooked spaghetti squash?

Absolutely. Leftover roasted spaghetti squash works very well. Make sure excess moisture is removed before assembling the casserole.

3. Why is my spaghetti squash lasagna watery?

Spaghetti squash naturally releases moisture. Using thick marinara sauce and allowing the cooked squash to cool and drain before assembly can help reduce excess liquid.

4. Can I add ground beef?

Yes. Brown ground beef separately, drain excess fat, and stir it into the marinara sauce before assembling the lasagna.

5. Can I make this recipe vegetarian?

Yes. The basic recipe is vegetarian. You can also add spinach, mushrooms, zucchini, or bell peppers for additional vegetables.

6. Can I freeze Spaghetti Squash Lasagna?

Yes, although the texture may become somewhat softer after thawing because spaghetti squash contains considerable moisture. Cool completely, portion into airtight containers, and freeze.

7. What cheese can I use instead of ricotta?

Cottage cheese, mascarpone, or a mixture of cream cheese and Parmesan can be used. Cottage cheese should be well drained before adding.

8. How do I reheat leftovers?

Reheat individual portions in the microwave until hot, or cover the casserole with foil and warm it in a 350°F (175°C) oven until heated through.