Name: Spaghetti Squash Lasagna Recipe
Prep time: 15 min
Cook time: 1 h
Total time: 1 h 15 min
Cuisine: Italian
Ingredients: 2 spaghetti squash (on the smaller side, about 1 1/2 – 2 lbs. each); 2 tablespoons olive oil (divided); Salt and pepper, to taste; 16 ounces Italian sausage (casings removed); 1 onion (chopped); 3 cloves garlic (minced); 2 cups marinara sauce (homemade or store bought); 1 cup ricotta cheese (use more ricotta as necessary to coat the spaghetti squash; substitute with cottage cheese if preferred); 1 large egg; 1/3 cup grated parmesan cheese; 1/4 cup freshly chopped basil (plus more for serving; optional); 2 cups grated mozzarella cheese

Jump to Recipe· 3.9 from 6 reviews

I absolutely love sharing this Spaghetti Squash Lasagna Recipe because it’s one of those dishes that feels comforting and indulgent but sneaks in a healthy twist. The tender strands of roasted spaghetti squash combined with savory Italian sausage, gooey mozzarella, and creamy ricotta make every bite feel like a warm hug. It’s perfect when I want all the flavor of classic lasagna without the heavy pasta layers, and I know you’re going to fall in love with it just like I did.

Why You’ll Love This Spaghetti Squash Lasagna Recipe

When I first made this Spaghetti Squash Lasagna Recipe, what struck me most was how the flavors melded together so beautifully. The natural sweetness of the roasted squash balances the rich, savory sausage and tangy marinara sauce, while the cheeses add a luscious creaminess that feels utterly indulgent without being overwhelming. It’s like a traditional lasagna, but fresher and lighter, which makes me excited every time I serve it.

Another reason I adore this recipe is how straightforward it is to prepare. Though it feels fancy, it really comes together with basic steps and simple ingredients, which means it’s perfect for both weeknight dinners and special occasions. I love pulling this dish out when friends come over or when I want a comforting dinner after a long day. Plus, it stands out because it’s gluten-free without any sacrifices in flavor or texture, and the spaghetti squash makes it feel a bit special compared to your everyday pasta bake.

Ingredients You’ll Need

A white marbled surface holds an assortment of cooking ingredients laid out neatly. At the center is a whole, yellow spaghetti squash with brown spots. Surrounding the squash are bowls and items arranged in a circular pattern: at top left, a white bowl filled with smooth, white ricotta cheese; top right, a white bowl of raw Italian sausage ground meat with pink and white colors mixed; below that on the right, a white bowl filled with crumbled white mozzarella cheese. In the lower right section is a small gray bowl of grated light beige parmesan cheese. To the left of that is a small bunch of green basil leaves, and above that a brown egg rests on the surface. Top left of the squash is a round brown onion, and below it is a bulb of garlic with white and light brown skin. Finally, on the lower left, there is a white bowl holding bright red marinara sauce with visible texture, marked sugar on it. The whole setting is well-lit, with soft natural light, clearly showing the textures and colors of each ingredient. Photo taken with an iphone --ar 4:5 --v 7

This recipe relies on a handful of essential ingredients, each adding its own delicious touch—from the fresh sweetness of the squash to the savory Italian sausage and the creamy cheeses that make this dish so satisfying.

Spaghetti squash: I recommend smaller ones, about 1 1/2 to 2 pounds each, for easy handling and perfect stringy texture.
Olive oil: Divided use, it’s perfect for roasting the squash and cooking the sausage, bringing out their rich flavors.

Italian sausage: Casings removed and cooked until golden, this adds wonderful heartiness to the dish.
Onion: Chopped and sautéed to add a subtle sweetness and depth.
Garlic: Minced, it infuses the sauce with that irresistible savory aroma.

Marinara sauce: Use your favorite homemade or quality store-bought version—it’s the flavorful base of this lasagna.
Ricotta cheese: Creamy and mild, it binds the squash and adds indulgent texture; cottage cheese works as a lighter swap.
Large egg: Helps hold the ricotta mixture together nicely.
Parmesan cheese: Freshly grated, it adds a nutty, salty finish to the ricotta mixture.

Fresh basil: Chopped for both mixing in and garnishing, it brightens the entire dish.
Mozzarella cheese: Shredded on top to create that irresistible melty, bubbly layer we all crave in lasagna.

Directions

Step 1: Preheat your oven to 400 degrees Fahrenheit. Begin by prepping your spaghetti squash: lay it horizontally on a cutting board, remove the stem, then carefully stand it upright and cut in half from top to bottom. Use caution here depending on your squash size.

Step 2: Scoop out all the seeds and stringy bits from each half with a large spoon. Brush the cut sides with 1 tablespoon of olive oil and season with salt and pepper to taste.

Step 3: Place the squash halves cut side down on a baking sheet and roast for 40 to 45 minutes, or until the flesh is tender and easily shredded with a fork.

Step 4: Once roasted and cool enough to handle, use a fork to shred the squash into spaghetti-like strands. You should have roughly 3 cups of squash for the recipe.

Step 5: While the squash roasts, heat the remaining tablespoon of olive oil in a large skillet over medium heat. Add the Italian sausage, breaking it up with a wooden spoon, and cook until golden brown and fully cooked through—about 5 minutes.

Step 6: Using a slotted spoon, transfer the cooked sausage to a bowl, leaving 1 tablespoon of the grease in the skillet. Add the chopped onion and sauté until softened, about 4-5 minutes.

Step 7: Add the minced garlic and cook for another 30 seconds until fragrant. Return the sausage to the skillet and pour in the marinara sauce. Simmer everything together for 5 to 8 minutes, then remove from heat.

Step 8: In a medium bowl, combine the ricotta cheese with the egg, stirring until smooth. Mix in the grated parmesan and chopped basil, then fold in the shredded spaghetti squash until fully incorporated.

Step 9: Divide the ricotta and squash mixture evenly into the four spaghetti squash halves, filling each but not to the very top, as you want room for the sauce and cheese layers.

Step 10: Spoon the sausage marinara mixture over the ricotta-filled squash halves, then sprinkle the grated mozzarella evenly on top.

Step 11: Bake the stuffed squash for 10 to 15 minutes until the cheese is melted and bubbly. If you want a golden-brown top, place under the broiler for 1 to 2 minutes—just watch carefully so it doesn’t burn.

Step 12: Remove from the oven and garnish with additional freshly chopped basil if you like. Serve immediately and enjoy the fantastic flavors you’ve created!

Servings and Timing

This Spaghetti Squash Lasagna Recipe makes about 4 servings, perfect for a satisfying family dinner or sharing with friends. Prep time takes roughly 20 minutes, mainly for cutting and prepping ingredients. The roasting process needs about 40-45 minutes, plus 10-15 minutes baking time for assembly and finishing. Altogether, you can expect a total time commitment of approximately 1 hour and 15 minutes, making it a wonderful weekend treat or a leisurely meal for any day.

How to Serve This Spaghetti Squash Lasagna Recipe

The image shows a close-up of three halves of baked spaghetti squash on a large metal baking tray. Each squash half serves as a bowl with a bright yellow-orange shell, filled with a thick layer of rich red tomato sauce mixed with ground meat or vegetables. On top, there is a generous melted white cheese layer scattered with small green basil leaves. The surface beneath the tray has a white marbled texture. photo taken with an iphone --ar 4:5 --v 7

When I serve this dish, I love pairing it with a simple green salad dressed in lemon vinaigrette to balance the richness of the lasagna. Roasted vegetables like asparagus or Brussels sprouts also make fantastic companions. For something heartier, a crusty garlic bread or cheesy breadsticks elevate the meal beautifully and soak up all that amazing sauce.

For presentation, I like to serve each spaghetti squash half on individual plates, garnished with fresh basil leaves for a pop of color and an inviting aroma. This also makes portion control easy and presents beautifully whether for an intimate dinner or casual gathering. Warm it up slightly before serving to keep the cheese perfectly melty and the inside tender.

If you’re looking for beverage pairings, this recipe goes wonderfully with a crisp Italian white wine like Pinot Grigio or a light red such as Chianti. For non-alcoholic options, sparkling water with a twist of lemon or a chilled iced tea complements the flavors without overpowering them. This lasagna shines at cozy family dinners, weekend lunches with friends, or even holiday gatherings when you want something comforting but a little different.

Variations

One of the best things about this Spaghetti Squash Lasagna Recipe is how adaptable it is. If you prefer a vegetarian version, you can easily omit the Italian sausage and add sautéed mushrooms or chopped spinach for a delicious alternative that still feels hearty. For a vegan adaptation, swap the ricotta for a cashew-based cheese or tofu ricotta and use vegan mozzarella for the topping.

If you want to change up flavors, try swapping the marinara for a spicy arrabbiata sauce or a creamy tomato basil sauce for an extra layer of richness. You can also experiment with different herbs like oregano or thyme depending on what you have on hand or what flavors you love. For a quicker method, some days I roast the spaghetti squash in the microwave to save time—just pierce the squash and cook it on high in increments of 5 minutes until tender.

For those watching carbs, this recipe is naturally gluten-free, which I love, but you could also mix in some cooked lentils into the sauce for added protein and texture without any gluten. The possibilities really make this dish a flexible favorite that I feel confident playing around with for all sorts of occasions.

Storage and Reheating

Storing Leftovers

Any leftovers of this spaghetti squash lasagna store beautifully in an airtight container in the refrigerator. I recommend using glass containers with tight-fitting lids to keep everything fresh and prevent the cheese from drying out. It will last well for about 3 to 4 days, making it easy to reheat for next-day lunches or even a quick dinner later in the week.

Freezing

This recipe freezes well, though I personally find the texture of the spaghetti squash stays best if frozen before baking. You can assemble the filled squash halves in a freezer-safe container or airtight bag and freeze for up to 2 months. When you’re ready to enjoy, thaw overnight in the fridge and then bake as instructed. If freezing the fully baked lasagna, wrap portions tightly in foil and plastic wrap to avoid freezer burn, and reheat gently to maintain texture.

Reheating

The best way to reheat leftover Spaghetti Squash Lasagna Recipe is in the oven at 350 degrees Fahrenheit, covered loosely with foil to prevent the cheese from drying out, until heated through—usually about 20 minutes. Avoid microwaving if possible, as the texture can become a bit mushy, although it works in a pinch. A quick broil at the end can help revive that melty, golden cheese crust and fresh basil garnish once reheated.

FAQs

Can I use a different type of squash instead of spaghetti squash?

While spaghetti squash is ideal for its stringy texture that mimics pasta, you could experiment with other firm squashes, but they won’t shred like spaghetti squash. Butternut squash, for example, is sweeter and more dense, better suited for casseroles rather than this lasagna style.

Is this Spaghetti Squash Lasagna Recipe gluten-free?

Yes! Since spaghetti squash naturally replaces pasta, this dish is inherently gluten-free, making it a fantastic alternative for anyone avoiding gluten without compromising on flavor or texture.

Can I prepare this recipe ahead of time?

Absolutely. You can roast the spaghetti squash a day or two before and prepare the filling in advance. Then simply assemble and bake when you’re ready to serve. This makes it great for meal prep or entertaining without last-minute stress.

What can I substitute for Italian sausage?

If you want to swap the Italian sausage, ground turkey or chicken seasoned with Italian herbs works well. For a vegetarian option, cooked lentils or crumbled tempeh add a nice protein boost and texture.

How do I make this recipe vegan?

You can replace the ricotta with a vegan cheese made from cashews or tofu and use dairy-free mozzarella alternatives. Omit the sausage or use a plant-based sausage substitute, and use olive oil to cook the veggies and garlic. The flavors will still be satisfying and comforting!

Conclusion

I truly hope you give this Spaghetti Squash Lasagna Recipe a try soon. It’s one of those dishes that feels like a special treat while still being simple and healthy enough for any night of the week. I love how it brings together comfort and nutrition, and I’m sure it will become a favorite in your kitchen as it is in mine. Enjoy every cheesy, flavorful bite!