Casseroles & Bakes

Spaghetti Squash Casserole

Name: Spaghetti Squash Casserole
Prep time: 30 min
Cook time: 45 min
Total time: 75 min
Yield: 6 servings
Ingredients: 1 lb (450g) ground beef; 1 large spaghetti squash, about 2 lbs (900g); 1 large onion, chopped; 3 cloves garlic, minced; 1 can (28 oz/794g) crushed tomatoes; 1 tsp (5g) dried oregano; 1 tsp (5g) dried basil; 1/2 tsp (2g) salt; 1/4 tsp (1g) black pepper; 1 cup (115g) shredded cheddar cheese; 1/4 cup (55g) grated Parmesan cheese

By Delia Sinclair · June 19, 2026 · Casseroles & Bakes

Prep30 min

Cook45 min

Total75 min

Serves6

Spaghetti Squash Casserole, a warm and inviting dinner

As the weather starts to cool down, I find myself craving comforting, homey dishes that warm the heart and soul. One of my favorite recipes to make during this time is Spaghetti Squash Casserole, a hearty, ground-beef based casserole that's perfect for busy weeknights and family gatherings. I love how the combination of tender spaghetti squash, flavorful ground beef, and creamy cheese comes together to create a truly satisfying meal.

I've been making this recipe for years, and it never fails to impress. The best part? It's incredibly easy to make and requires minimal ingredients. You likely have most of the pantry staples, such as canned tomatoes, olive oil, and spices, already stocked in your kitchen. The spaghetti squash, ground beef, and cheese can be found at your local grocery store, making this recipe a breeze to shop for.

What I love most about this recipe is its versatility. You can customize it to your taste by adding your favorite spices or herbs, and it's also a great way to use up any leftover vegetables you have on hand. Whether you're a busy parent looking for a quick and easy dinner solution or a foodie looking to impress your friends and family, this Spaghetti Squash Casserole recipe is sure to become a staple in your household.

In this recipe, we'll be using a combination of ground beef, spaghetti squash, and cheese to create a rich and satisfying casserole. We'll start by cooking the ground beef and onions, then add in the canned tomatoes and spices. Next, we'll roast the spaghetti squash in the oven until it's tender, then combine it with the ground beef mixture and cheese. Finally, we'll bake the casserole in the oven until it's golden brown and bubbly.

So, if you're looking for a delicious and comforting meal that's perfect for any occasion, look no further than this Spaghetti Squash Casserole recipe. With its rich flavors, tender texture, and ease of preparation, it's sure to become a favorite in your household.

Why You’ll Love This Recipe

This recipe is easy to make and requires minimal ingredients, making it perfect for busy weeknights.
The combination of ground beef, spaghetti squash, and cheese creates a rich and satisfying flavor profile that's sure to impress.
The recipe is highly customizable, allowing you to add your favorite spices or herbs to suit your taste.
It's a great way to use up any leftover vegetables you have on hand, reducing food waste and saving you money.
The casserole is perfect for family gatherings or potlucks, as it serves a large crowd and can be easily transported.
The recipe is budget-friendly, using affordable ingredients that won't break the bank.
It's a comforting and indulgent meal that's sure to become a staple in your household.

Why This Recipe Works

The key to this recipe's success lies in its layering of flavors and textures. By cooking the ground beef and onions until they're nicely browned, we create a deep, rich flavor that's enhanced by the addition of canned tomatoes and spices. The spaghetti squash, roasted to perfection in the oven, adds a tender and slightly sweet element to the dish, while the cheese provides a creamy and indulgent touch.

Another important aspect of this recipe is its use of heat control. By cooking the ground beef over medium-high heat, we're able to achieve a nice sear on the meat, which helps to lock in the juices and flavors. The oven, set at 400°F, provides the perfect environment for the spaghetti squash to roast, allowing it to become tender and caramelized.

The combination of these elements, along with the resting time after baking, allows the flavors to meld together and the casserole to set, resulting in a dish that's both satisfying and delicious. Whether you're a seasoned cook or a beginner, this recipe is sure to impress, and its ease of preparation makes it a great option for any occasion.

Overall, the success of this recipe can be attributed to its balance of flavors, textures, and temperatures. By following the steps and using the right ingredients, you'll be able to create a truly exceptional Spaghetti Squash Casserole that's sure to become a favorite in your household.

Ingredients You’ll Need

When it comes to making this Spaghetti Squash Casserole, it's all about using high-quality ingredients that will add depth and flavor to the dish. From the tender spaghetti squash to the rich ground beef, every component plays a crucial role in creating a truly exceptional meal. In this section, we'll take a closer look at the ingredients you'll need to make this recipe, and provide some tips on how to choose the best ones.

One of the most important ingredients in this recipe is the spaghetti squash. Look for a squash that's firm and heavy, with a sweet and nutty aroma. You'll also want to choose a good quality ground beef, preferably one that's lean and has a high percentage of meat. The cheese, onions, garlic, and canned tomatoes are also essential components, and should be chosen based on their freshness and flavor.

1 lb (450g) ground beefChoose a lean ground beef with a high percentage of meat, preferably 85% or higher, for the best flavor and texture.
1 large spaghetti squash, about 2 lbs (900g)Look for a firm and heavy squash with a sweet and nutty aroma, and make sure it's free of any soft spots or blemishes.
1 large onion, choppedUse a sweet onion, such as Vidalia or Maui, for the best flavor, and make sure to chop it finely to ensure it cooks evenly.
3 cloves garlic, mincedUse fresh garlic for the best flavor, and mince it finely to ensure it distributes evenly throughout the dish.
1 can (28 oz/794g) crushed tomatoesChoose a high-quality canned tomato with no added salt or sugar, and look for one that's made with San Marzano tomatoes for the best flavor.
1 tsp (5g) dried oreganoUse a high-quality dried oregano that's fresh and fragrant, and make sure to store it in an airtight container to preserve its flavor.
1 tsp (5g) dried basilChoose a sweet and fragrant dried basil, and make sure to use it within a few months of opening to ensure the best flavor.
1/2 tsp (2g) saltUse a high-quality salt, such as kosher or sea salt, for the best flavor, and make sure to use it sparingly to avoid over-salting the dish.
1/4 tsp (1g) black pepperUse a freshly ground black pepper for the best flavor, and make sure to use it sparingly to avoid over-peppering the dish.
1 cup (115g) shredded cheddar cheeseChoose a high-quality cheddar cheese that's sharp and flavorful, and make sure to shred it finely to ensure it melts evenly.
1/4 cup (55g) grated Parmesan cheeseUse a high-quality Parmesan cheese that's nutty and flavorful, and make sure to grate it finely to ensure it distributes evenly throughout the dish.

Ingredients for Spaghetti Squash Casserole

Equipment You’ll Need

Large heavy skillet or Dutch ovenSharp chef's knifeCutting boardInstant-read thermometerLarge bowlWhiskMeasuring cups and spoons

How to Make Spaghetti Squash Casserole

1
Preheat your oven to 400°F (200°C), and make sure to adjust the racks to ensure even cooking.
2
Cut the spaghetti squash in half lengthwise, and scoop out the seeds and pulp. Place it on a baking sheet, cut side up, and roast in the oven for about 45 minutes, or until the flesh is tender and easily shreds with a fork.
3
While the squash is roasting, cook the ground beef in a large skillet over medium-high heat, breaking it up with a spoon as it cooks, until it's no longer pink, about 5-7 minutes. Drain the excess fat, and add the chopped onion and minced garlic. Cook until the onion is translucent, about 3-4 minutes.
4
Add the crushed tomatoes, dried oregano, dried basil, salt, and black pepper to the skillet, and stir to combine. Bring the mixture to a simmer, and let it cook for about 10-15 minutes, stirring occasionally, until the sauce has thickened and the flavors have melded together.
5
Once the squash is done roasting, let it cool for a few minutes, then use a fork to shred the flesh into strands. Add the shredded squash to the skillet with the ground beef mixture, and stir to combine.
6
In a large bowl, combine the shredded cheddar cheese and grated Parmesan cheese. Add the squash and ground beef mixture to the bowl, and stir until the cheese is well combined and the mixture is heated through.
7
Transfer the mixture to a 9x13 inch baking dish, and top with additional shredded cheese if desired. Bake in the preheated oven for about 20-25 minutes, or until the cheese is melted and bubbly.
8
Remove the casserole from the oven, and let it rest for about 10-15 minutes before serving. This will allow the flavors to meld together and the casserole to set.
9
Serve the casserole hot, garnished with chopped fresh herbs or a sprinkle of grated cheese, if desired.
10
To ensure the casserole is cooked to a safe internal temperature, use an instant-read thermometer to check the temperature. The internal temperature should be at least 165°F (74°C) to ensure food safety.
11
Let the casserole rest for a few minutes before serving, and make sure to use a clean and sanitized utensil to serve.

Expert Tips

To ensure the spaghetti squash is cooked to perfection, make sure to roast it at a high temperature, about 400°F (200°C), and for a sufficient amount of time, about 45 minutes.
Use a high-quality ground beef that's lean and has a high percentage of meat, preferably 85% or higher, for the best flavor and texture.
Don't overcook the ground beef mixture, as it can become dry and tough. Cook it until it's just browned, then add the crushed tomatoes and spices.
Use a variety of cheese, such as cheddar and Parmesan, to add depth and complexity to the dish.
To add some extra flavor to the dish, try adding some diced bell peppers or mushrooms to the ground beef mixture.
Make sure to let the casserole rest for a few minutes before serving, as this will allow the flavors to meld together and the casserole to set.
To reheat the casserole, simply cover it with foil and bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.
To freeze the casserole, simply assemble the dish, but don't bake it. Cover it with plastic wrap or aluminum foil, and freeze for up to 3 months. To reheat, thaw overnight in the fridge, then bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.

Common Mistakes to Avoid

Overcooking the ground beef mixture, which can make it dry and tough.
Not roasting the spaghetti squash at a high enough temperature, which can result in a squash that's not tender or caramelized.
Not letting the casserole rest for a few minutes before serving, which can cause the flavors to be disjointed and the casserole to be runny.
Using low-quality ingredients, such as ground beef that's too fatty or cheese that's too processed, which can affect the overall flavor and texture of the dish.
Not using a variety of cheese, which can result in a dish that's lacking in depth and complexity.
Not adding enough spices or herbs, which can result in a dish that's bland and uninteresting.

Variations and Substitutions

Try adding some diced bell peppers or mushrooms to the ground beef mixture for added flavor and nutrition.
Use a variety of cheese, such as cheddar, Parmesan, and mozzarella, to add depth and complexity to the dish.
Add some heat to the dish by incorporating some diced jalapenos or red pepper flakes into the ground beef mixture.
Use a different type of squash, such as acorn or butternut, for a different flavor and texture.
Try adding some cooked sausage, such as Italian sausage or chorizo, to the ground beef mixture for added flavor and spice.
Use a different type of tomato, such as crushed or diced, for a different texture and flavor.
Add some fresh herbs, such as parsley or basil, to the dish for added flavor and freshness.

What to Serve With Spaghetti Squash Casserole

This Spaghetti Squash Casserole is perfect for serving as a main dish, and can be paired with a variety of sides, such as a green salad, garlic bread, or roasted vegetables. It's also a great option for potlucks or family gatherings, as it's easy to transport and can be served hot or cold.

Some other ideas for serving this dish include serving it with a side of marinara sauce or a sprinkle of grated cheese. You could also try serving it with a side of sautéed spinach or roasted broccoli for added nutrition and flavor.

Garlic breadGreen saladRoasted vegetablesMarinara sauceGrated cheeseSautéed spinach

Make-Ahead, Storage, Freezing and Reheating

This Spaghetti Squash Casserole can be stored in the fridge for up to 3 days, or frozen for up to 3 months. To reheat, simply cover it with foil and bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.

To freeze the casserole, simply assemble the dish, but don't bake it. Cover it with plastic wrap or aluminum foil, and freeze for up to 3 months. To reheat, thaw overnight in the fridge, then bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.

It's also a good idea to label and date the casserole, so you can easily keep track of how long it's been stored. When reheating, make sure to check the casserole for any signs of spoilage, such as an off smell or slimy texture.

In addition to storing the casserole, you can also store the individual components, such as the cooked spaghetti squash or the ground beef mixture, in separate containers in the fridge or freezer. This can be a great way to meal prep or plan ahead for future meals.

Frequently Asked Questions

What type of squash is best for this recipe?

The best type of squash for this recipe is spaghetti squash, as it has a sweet and nutty flavor and a tender, stringy texture. You can also try using other types of squash, such as acorn or butternut, for a different flavor and texture.

Can I use frozen squash for this recipe?

Yes, you can use frozen squash for this recipe. Simply thaw the squash according to the package instructions, then proceed with the recipe as directed.

Can I make this recipe ahead of time?

Yes, you can make this recipe ahead of time. Simply assemble the casserole, but don't bake it. Cover it with plastic wrap or aluminum foil, and refrigerate for up to 24 hours or freeze for up to 3 months. To reheat, thaw overnight in the fridge, then bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.

Can I use a different type of cheese for this recipe?

Yes, you can use a different type of cheese for this recipe. Some good options include cheddar, Parmesan, mozzarella, and ricotta. You can also try using a combination of cheeses for a unique flavor profile.

Is this recipe gluten-free?

Yes, this recipe is gluten-free, as it does not contain any gluten-containing ingredients. However, if you're using a store-bought tomato sauce or cheese, make sure to check the ingredients list to ensure that it's gluten-free.

Can I make this recipe in a slow cooker?

Yes, you can make this recipe in a slow cooker. Simply assemble the casserole, but don't bake it. Place it in the slow cooker, and cook on low for about 3-4 hours, or until the casserole is hot and the cheese is melted and bubbly.

Can I freeze the casserole after it's been baked?

Yes, you can freeze the casserole after it's been baked. Simply let it cool to room temperature, then cover it with plastic wrap or aluminum foil and freeze for up to 3 months. To reheat, thaw overnight in the fridge, then bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through.

How do I reheat the casserole?

To reheat the casserole, simply cover it with foil and bake in a preheated oven at 350°F (180°C) for about 20-25 minutes, or until heated through. You can also try reheating it in the microwave, but be careful not to overheat it, as this can cause the cheese to melt unevenly and the casserole to become dry.

The Full Recipe

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