Spaghetti Squash Casserole
There’s something magical about a cozy evening spent preparing a warm and delectable dish like Spaghetti Squash Casserole. I remember the first time I experimented with spaghetti squash, looking for a healthier alternative to traditional pasta. The first bite was a revelation; the tender strands of squash swirled with rich flavors and melted cheese made my heart sing. It quickly became a staple in my kitchen, a dish I could whip up during busy weeknights or serve to friends at a gathering. The beauty of Spaghetti Squash Casserole is that it’s not just about nourishment; it’s about bringing people together, enjoying the simple pleasures of home cooking, and savoring every layer of flavor. From the warm, comforting aroma that fills the kitchen to the satisfied smiles around the table, this casserole is a true celebration of wholesome cooking.
Recipe Snapshot
35 mins
10 mins
25 mins
Medium
350 kcal
22 g
Keto, Gluten-Free, Low FODMAP
18 g
Mixing Bowl, Baking Sheet, Wooden Spoon, Skillet, Frying Pan, Oven, Cutting Board, Saucepan
What You’ll Enjoy About This Spaghetti Squash Casserole
Comfort in Every Bite
One of the reasons I adore Spaghetti Squash Casserole is its incredible comfort factor. When the days get shorter and the nights grow cooler, there’s nothing better than curling up with a hearty meal that warms you from the inside out. The combination of flavors and textures in this dish makes it feel like a warm hug, perfect for any chilly night.
Nutritious and Delicious
This casserole is not just delicious; it’s packed with nutrients too! The star ingredient, spaghetti squash, is low in calories and high in fiber, making it a fantastic choice for those looking to eat healthily without sacrificing flavor. Combined with the added benefits of fresh vegetables and lean protein, you can feel good about enjoying every bite.
Easy to Prepare
As a busy home cook, I appreciate recipes that don’t require hours in the kitchen. Spaghetti Squash Casserole comes together relatively quickly, especially if you prep some of the ingredients in advance. It’s a dish you can easily make on a Sunday and enjoy throughout the week!
Versatile and Customizable
This casserole is incredibly versatile. You can easily swap out ingredients based on your preferences or what you have on hand. Don’t like spicy sausage? Substitute it for turkey or a plant-based option. Want to add more vegetables? Toss in some spinach or bell peppers for an extra health boost. The possibilities are endless!
A Crowd-Pleaser
One of my favorite things about Spaghetti Squash Casserole is how well it shares. Whether it’s a family gathering or a potluck with friends, this dish never fails to impress. The combination of melty cheese and savory sauce over tender squash always leaves everyone asking for seconds.
Main Ingredients for Spaghetti Squash Casserole

The ingredients for Spaghetti Squash Casserole are not only wholesome but also work beautifully together to create a satisfying meal. At the heart of this dish is the spaghetti squash, which serves as a fantastic low-carb alternative to pasta. The addition of olive oil, onion, and Italian sausage infuses the casserole with rich flavors, while crushed tomatoes and mozzarella cheese tie everything together, creating a melty, comforting topping.
- 1 Spaghetti Squash – The main ingredient, providing a healthy noodle alternative packed with fiber and vitamins.
- 2 TBSP Olive Oil – For sautéing and adding healthy fats.
- 1 Yellow Onion (diced) – Adds sweetness and depth of flavor.
- 1 lb Hot Italian Sausage – Provides savory, spicy notes that enhance the dish’s overall flavor profile.
- 4 Garlic Cloves (minced) – Essential for that aromatic base that elevates the dish.
- 28 ounces Crushed Tomatoes – The perfect sauce for binding all the ingredients together.
- Salt – A necessary seasoning for bringing out all the flavors.
- Pepper – For a little kick and additional flavor.
- 1 tsp Oregano – Adds a fragrant herbaceous quality to the casserole.
- 8 ounces Whole Milk Mozzarella Cheese (shredded) – A melty topping that brings the dish to life.
Recipe Directions for Spaghetti Squash Casserole

Cooking Spaghetti Squash Casserole is a delightful experience that fills the kitchen with its enticing aromas. Let’s get started with this simple yet rewarding recipe. Follow these steps to create a dish that your family will love.
- Preheat your oven to 350 degrees F. This will ensure a perfectly baked casserole that’s warm and gooey when it’s done.
- Prepare the spaghetti squash by cutting it in half lengthwise and scooping out the seeds. Place the cut sides down on a microwave-safe dish. Microwave it for 12 to 15 minutes, or until the flesh is easily pierced with a knife. This method softens the squash quickly and efficiently.
- Once the squash has cooled enough to handle, use a fork to shred the flesh into noodle-like strands. This is where the magic happens; the “noodles” should look inviting and fluffy.
- Wrap the shredded squash in a towel and squeeze out as much excess moisture as possible. This step is crucial; it ensures your casserole doesn’t turn out watery.
- Meanwhile, heat olive oil in a large sauté pan over medium heat. Once hot, add the onions and sauté until they start to soften, about 5 minutes. The onions should become translucent, releasing their sweetness.
- Add the hot Italian sausage to the pan and cook until browned. Make sure to drain any excess fat; you want the flavor without the greasiness.
- Stir in the minced garlic and cook for about 30 seconds, until fragrant. You’ll know it’s ready when the aroma fills your kitchen.
- Now, pour in the crushed tomatoes, along with salt, pepper, and oregano. Stir everything to combine, then reduce the heat and let it simmer for about 10 minutes. This will marry all the flavors together beautifully.
- Remove about 1 cup of the sauce from the pan and set it aside. This reserved sauce will add moisture to the top of your casserole.
- Add the shredded spaghetti squash to the remaining sauce in the pan and mix well. The squash should be fully coated in the rich, tomatoey goodness.
- Transfer the mixture to a large casserole pan. Make sure to spread it evenly for even cooking.
- Top the mixture with the reserved sauce and then sprinkle generously with shredded mozzarella cheese.
- Place the casserole in the oven and bake for 10 to 15 minutes, or until the cheese is melted and bubbly. If you desire a golden top, finish it under the broiler for just 1 to 2 minutes.
Enjoy your homemade Spaghetti Squash Casserole hot from the oven!
Things Worth Knowing
- Keep an eye on the spaghetti squash while microwaving; every microwave is different, and it can overcook quickly.
- Make sure to squeeze out as much moisture from the squash as possible; this prevents a soggy casserole.
- For an extra layer of flavor, consider adding fresh herbs like basil or parsley right before serving.
- This dish can easily be made ahead of time; assemble it and then refrigerate until you’re ready to bake.
Making Adjustments

Every cook has their own touch, and adjusting recipes to suit your taste can be a fun part of the cooking process. Here are some thoughts on how to make Spaghetti Squash Casserole your own:
- Storage: Leftovers can be stored in an airtight container in the fridge for up to four days, making it a great option for meal prep.
- Freezing: This casserole can be frozen before or after baking. Just ensure it’s in a suitable container. Thaw it overnight in the fridge before reheating.
- Pairing: Serve this casserole with a crisp salad or some garlic bread to complete the meal.
- Variations: Experiment with different proteins, like ground turkey or a vegetarian sausage, for a unique twist.
- Spice Level: If you prefer a milder dish, use sweet Italian sausage or omit spicy elements entirely.
What Complements This Spaghetti Squash Casserole
Pairing your Spaghetti Squash Casserole with the right accompaniments can elevate your meal to the next level. Here are some suggestions:
- Salads: A light, fresh green salad with a simple vinaigrette can balance the richness of the casserole.
- Garlic Bread: Serve with warm, buttery garlic bread for a comforting side that complements the flavors perfectly.
- Seasonal Sides: Roasted seasonal vegetables, such as Brussels sprouts or carrots, can add color and nutrition.
- Occasional Serving: This dish is perfect for cozy family dinners during fall or winter evenings.
- Meal Prep: Consider making a double batch to enjoy throughout the week, as it reheats beautifully.
FAQ
Conclusion
The Spaghetti Squash Casserole is a comforting and nutritious dish that brings joy to any dining table. Its delightful combination of flavors and textures makes it a favorite for family dinners, and its versatility allows for countless variations. Don’t hesitate to try this recipe; it’s not just about feeding the body but also nourishing the soul. I encourage you to whip up this dish tonight and experience the satisfaction of a delicious homemade meal!

Spaghetti Squash Casserole
Equipment
- Mixing Bowl
- Baking Sheet
- Wooden Spoon
- Skillet
- Frying Pan
- Oven
- Cutting Board
- Saucepan
Ingredients
- 1 Spaghetti Squash
- 2 TBSP Olive Oil
- 1 Yellow Onion diced
- 1 lb Hot Italian Sausage
- 4 Garlic Cloves minced
- 28 ounces Crushed Tomatoes
- Salt
- Pepper
- 1 tsp Oregano
- 8 ounces Whole Milk Mozzarella Cheese shredded
Instructions
- Preheat your oven to 350 degrees F. This will ensure a perfectly baked casserole that’s warm and gooey when it’s done.
- Prepare the spaghetti squash by cutting it in half lengthwise and scooping out the seeds. Place the cut sides down on a microwave-safe dish. Microwave it for 12 to 15 minutes, or until the flesh is easily pierced with a knife. This method softens the squash quickly and efficiently.
- Once the squash has cooled enough to handle, use a fork to shred the flesh into noodle-like strands. This is where the magic happens; the “noodles” should look inviting and fluffy.
- Wrap the shredded squash in a towel and squeeze out as much excess moisture as possible. This step is crucial; it ensures your casserole doesn’t turn out watery.
- Meanwhile, heat olive oil in a large sauté pan over medium heat. Once hot, add the onions and sauté until they start to soften, about 5 minutes. The onions should become translucent, releasing their sweetness.
- Add the hot Italian sausage to the pan and cook until browned. Make sure to drain any excess fat; you want the flavor without the greasiness.
- Stir in the minced garlic and cook for about 30 seconds, until fragrant. You’ll know it’s ready when the aroma fills your kitchen.
- Now, pour in the crushed tomatoes, along with salt, pepper, and oregano. Stir everything to combine, then reduce the heat and let it simmer for about 10 minutes. This will marry all the flavors together beautifully.
- Remove about 1 cup of the sauce from the pan and set it aside. This reserved sauce will add moisture to the top of your casserole.
- Add the shredded spaghetti squash to the remaining sauce in the pan and mix well. The squash should be fully coated in the rich, tomatoey goodness.
- Transfer the mixture to a large casserole pan. Make sure to spread it evenly for even cooking.
- Top the mixture with the reserved sauce and then sprinkle generously with shredded mozzarella cheese.
- Place the casserole in the oven and bake for 10 to 15 minutes, or until the cheese is melted and bubbly. If you desire a golden top, finish it under the broiler for just 1 to 2 minutes.
Notes
- Tip 1: Leftovers can be stored in an airtight container in the fridge for up to four days, making it a great option for meal prep.
- Tip 2: This casserole can be frozen before or after baking. Just ensure it's in a suitable container. Thaw it overnight in the fridge before reheating.
- Tip 3: Serve this casserole with a crisp salad or some garlic bread to complete the meal.
- Tip 4: Experiment with different proteins, like ground turkey or a vegetarian sausage, for a unique twist.
- Tip 5: If you prefer a milder dish, use sweet Italian sausage or omit spicy elements entirely.


