Craving lasagna but want to skip the heavy pasta? This Italian Spaghetti Squash Bake is the answer. Packed with zesty sausage, rich marinara, and gooey mozzarella, it delivers all the comfort of a classic casserole in a lighter, gluten-free, low-carb package. It is a 'real food' dinner that is easy to make and guaranteed to be a hit with the whole family.
Why the Spaghetti Squash Bake Works
This recipe is a favorite because it bridges the gap between healthy eating and true comfort food. Here is why it earns a spot in the regular dinner rotation
- Spaghetti Squash: The star of the show! When roasted, it shreds into tender, pasta-like strands that absorb the sauce beautifully without the heaviness of wheat pasta.
- It Satisfies the Craving By combining the classic trio of savory Italian sausage, rich marinara, and melted mozzarella, this dish delivers the exact flavor profile of a traditional lasagna or baked ziti. You get all the warmth and satisfaction of a pasta bake without the heavy feeling that often follows a carb-dense meal.
- Texture That Holds Up Spaghetti squash can sometimes be watery, but roasting it cut-side down first ensures excess moisture escapes. This creates tender, distinct strands that mimic angel hair pasta and hold the sauce beautifully rather than turning into mush.
- Flavor in Every Bite Using Italian sausage is a smart shortcut for building deep flavor. Because the sausage is already seasoned with fennel, garlic, and herbs, you do not need a long list of spices to make the dish taste complex and savory.
- Real Food for Real Life This meal fits perfectly into a busy schedule. It uses simple, whole ingredients found in any grocery store and requires minimal hands-on time. It is a practical way to get a nutritious, vegetable-forward meal on the table that the whole family will actually want to eat.
- Dietary Flexibility It naturally fits a variety of dietary needs. It is naturally gluten-free and lower in carbohydrates, making it a safe and delicious option for serving guests with different nutritional requirements without having to make a separate meal.
The Ingredients for the Italian Spahgetti Squash Bake
- 1 medium Spaghetti Squash (about 3-4 lbs): The base of the casserole. When roasted, it yields tender strands that mimic pasta and soak up the sauce without the heaviness of wheat.
- 1 lb Italian Sausage: Using bulk sausage (mild or hot) creates a savory, hearty foundation. It ensures every bite is packed with protein and flavor.
- 2 cups Marinara Sauce: A good quality jarred sauce keeps this recipe quick and easy, adding moisture and acidity to balance the rich cheese.
- 16 oz Mozzarella Cheese: Shredded mozzarella creates the essential gooey, golden-brown crust that makes this feel like a true indulgence.
- 2 tablespoon Olive Oil, Salt & Pepper: Essential for seasoning the squash before roasting to ensure the vegetable itself tastes great, not just the toppings.
Baking and Shredding the Spaghetti Squash
Roasting spaghetti squash is simple, but cutting it safely is the most important part! Here is the best way to get tender, pasta-like strands every time.
- Prepare the Squash: Carefully cut the spaghetti squash in half lengthwise with a sharp chef's knife. Use a large spoon to scoop out the seeds and stringy pulp, just like you would with a pumpkin.
- Season Well: Drizzle or brush the inside of each half with about a tablespoon of olive oil. Generously sprinkle with sea salt and cracked black pepper.
- Roast: Place the halves cut-side down on a baking sheet lined with parchment paper. This traps steam and helps the squash cook evenly. Bake at 375°F for about 40 minutes.
- Test for Doneness: To check if it is ready, insert a small knife into the skin side. If it slides in easily with no resistance, the squash is done. Let it cool slightly before shredding with a fork.
- Tip: If your squash is wobbling while you try to cut it, slice a tiny piece off the bottom to create a flat, stable surface before slicing it in half.



How to Layer and Bake the Casserole
- Cook the Sausage: While the squash roasts, brown the Italian sausage in a large skillet over medium-high heat. Break it up with a wooden spoon as it cooks until no pink remains. Drain any excess grease if necessary.
- Shred the Strands: Once the squash is cool enough to handle, use a fork to scrape the flesh. It will separate easily into spaghetti-like strands.
- Assemble the Layers: In an 8x8 or 9x9 inch baking dish, spread half of the squash strands. Top with half of the cooked sausage, half of the sauce, and half of the mozzarella cheese. Repeat these layers once more ending with cheese.
- Final Bake: Cover the dish with foil (tent it slightly so the cheese doesn't stick). Bake at 375°F for 15 minutes. Remove the foil and bake for another 15 minutes, or until the cheese is bubbly and golden brown.
Try my Cheap and Easy Italian Bake or Italian Sheet Pan Bake for some other easy dinner recipes!
This is just one of the great dinners I have on my site. Try out some others!
FAQ's:
Yes, this is a great recipe for meal prep. You can bake and shred the spaghetti squash and brown the sausage up to 2 days in advance. Store them in separate airtight containers in the refrigerator. When you are ready, simply assemble the layers and bake as directed.
Store any leftovers in an airtight container in the refrigerator for up to 4 days. To reheat, you can use a microwave for individual portions or place the baking dish back in a 350-degree oven for 15-20 minutes, or until heated through.
Absolutely. For best results, assemble the entire casserole in a freezer-safe dish but do not bake it. Cover it tightly with plastic wrap and then foil. It can be frozen for up to 3 months. To cook, thaw it in the refrigerator overnight and then bake as the original instructions indicate, adding 10-15 minutes to the covered baking time.
If you'd like a different flavor, you can easily substitute ground turkey, ground chicken, or lean ground beef. For a vegetarian option, you could use a plant-based ground meat substitute or sautéed mushrooms and spinach.
This bake is a wonderful all-in-one meal. If you want to add some sides, a simple green salad with a light vinaigrette or some blistered green beans would be an excellent complement.
Looking for more cozy inspiration? Browse my full collection of Comfort Food Recipes to find your next family favorite.
Recipe

Italian Spaghetti Squash Bake
Ingredients
- 1 spaghetti squash
- 2 tablespoons olive oil
- ½ teaspoon of sea salt
- ½ teaspoon cracked black pepper
- 1 pound of italian sausage
- 2 cups of your favorite spaghetti sauce
- 16 oz shredded Mozzarella cheese
Method
- Cut the spaghetti squash in half lengthwise and clean out seeds and discard the seeds.
- Brush the inside of the spaghetti squash halves with olive oil. Then sprinkle both halves with sea salt and cracked pepper.
- Place halves cut side down on a lined baking sheet. Bake at 375 degrees for 40 minutes.
- While the squash is baking, brown the sausage in an appropriately sized skillet and set aside.
- To test that the spaghetti squash is done, insert a knife into the skin side. If the knife inserts easily, the squash is done.
- Once the spaghetti squash is done cooking and cooled, shred the squash with a fork. It will separate from the skin of the squash easily.
- In an 8 x 8 or 9 x 9 inch baking dish, layer the squash, then sauce, then sausage, then cheese. Repeat again for the second layer.
- Bake covered at 375 for 15 minutes. Make sure to tent the foil to make sure the cheese does not stick to the foil. Bake uncovered for an additional 15 minutes or until the cheese is golden brown and delicious.
Nutrition
Notes
- Watery Squash? If your squash seems very wet after shredding, place the strands in a colander or on paper towels for 10 minutes to drain excess moisture before assembling the bake.
- Cheese Variety: Feel free to mix in some Parmesan or Provolone for a sharper cheese flavor.
- Make it Spicy: Add a pinch of red pepper flakes to the sauce layer for a little kick.






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