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Spaghetti Squash Pizza Casserole

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Low carb comfort food just got a little more tasty with this Spaghetti Squash Pizza Casserole! Cooked spaghetti squash meets Italian sausage and marinara sauce. Add your favorite pizza toppings and bake!

spaghetti squash pizza casserole

I love spaghetti squash. It’s such an amazing garden wonder with it’s transformed insides. If there was ever a vegetable that was a low carb spaghetti replacement, this is it!

Even weirder (or should I say nicer), our family will eat it! Wonders never cease, friends.

If you have picky eaters, there is hope.

Before we get started friends, let me address the elephant in the room. These squash casserole photos. They are taken at 8 pm on a Tuesday night during harvest. 

Basically that means I did this while my hair was on fire, lol. So once things slow down (like in 2063), I’ll get some Instagram worthy photos on here.

But I didn’t want to keep this delicious recipe from you, especially while it’s spaghetti squash season. 

Let’s carry on now…

spaghetti squash pizza casserole

Why you’ll love this pizza casserole recipe

Healthy-ish – Spaghetti squash recipes let us eat the flavors we love but in low carb form. There’s no skimping of flavors (or cheese) here. Trust me, I wouldn’t let that happen.

Customizable – you can add whatever toppings you like

Leftovers are delicious! Like, possibly even better than eating straight outta the oven. If you’re on the struggle bus for packed lunches, meet your new best friend.

Ingredients

  • cooked spaghetti squash – I’ll give you a quick lowdown below on how to roast spaghetti squash, or you can check out how to cook whole spaghetti squash.
  • mild Italian sausage – you can use bulk sausage or if you have link sausage, just cut it out of the casing before browning.
  • eggs – these help the pizza casserole set up and keep it’s shape
  • Italian seasoning – a mix of oregano, basil and other spices
  • grated parmesan cheese – of course, you can use shredded Parmesan too. I like how the grated cheese melted into everything and gives a subtle salty, cheesy flavor
  • marinara sauce – sugar free, if possible. I’ve been digging this one. You’d be amazing at some of the additives in jarred spaghetti sauce. If you’re out of marinara, use spaghetti sauce or even tomato sauce with a little garlic and salt added.
spaghetti squash pizza casserole

How to make spaghetti squash pizza casserole

Step 1: Roast your spaghetti squash. You can cook the spaghetti squash whole in your microwave, or you can roast it in your oven. 

Cut off the stem part of the squash for easy cutting. Then, cut the squash in half lengthwise and scoop out the seeds.

If the squash is really hard to cut, sometimes I’ll microwave it for five minutes or so just to make it a tad softer.

Heat your oven to 400°F. Place the squash cut side down on a pan and bake until cooked through, about 35-40 minutes. You’ll be able to tell it’s done when you can easily pierce the squash with a sharp knife.

Step 2: Make the filling.  Cook the Italian sausage in a medium sized skillet, breaking into pieces until it’s cooked through. Remove from heat. Drain fat if necessary and return to the pan, then add the marinara sauce and Italian seasoning. Stir to combine and set aside.

This is a great task to work on if you’re roasting your spaghetti squash in real time. 

Step 3: Prep spaghetti squash. Once your squash is transformed to roasted spaghetti squash, remove it from the oven and flip it over, cut side up, so it can begin to cool. And then the magic begins…

Once you can handle it, remove the spaghetti squash strands with a fork and place them in a large bowl.  It will make little strands, kinda like spaghetti – get it???

Step 4: Combine your casserole. To your spaghetti squash, add the meat sauce mixture, whisked eggs, and parmesan cheese. If there are any toppings you’d like to add, mix those in too. Fold everything together, making sure it’s all mixed. Transfer to an 8×8 or 9×9 casserole dish. You can top with a little extra cheese, if you want. 

You probably should.

Step 5: Bake it, baby! Put the pizza casserole in your oven and bake at 375°F for 35-40 minutes or until the center is set and the sides of the casserole are bubbly.

Remove from oven and allow to cool slightly before serving.

spaghetti squash pizza casserole

Tips for spaghetti squash pizza casserole:

  • You may have to wait 20 minutes or so for the spaghetti squash to cool enough to handle.
  • If you’re a meal prep kind of person, you can cook the spaghetti squash a day ahead of time and refrigerate it until you’re ready to make the pizza casserole.
  • You can decide what add ins you’d like to include. Think about your favorite pizza toppings. You could add sliced mushrooms, sliced black olives or chopped green pepper.

Basically, whatever you’d put on top of a pizza, you can put in this casserole!

FAQS

Can I make baked spaghetti squash pizza casserole ahead of time?

Variations:

  • Use spicy Italian sausage, ground beef, or ground pork in palace of the Italian Sausage
  • Make it fancy and top the cooked spaghetti squash casserole with fresh basil or Italian parsley
  • Cook it in a pie dish and you can rebrand it as spaghetti pizza pie!

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Buffalo Chicken Spaghetti Squash

Low Carb Cauliflower Mash

When you make this spaghetti squash pizza casserole, leave a comment or review below. I’d love to hear from you!

Yield: 6 servings

Spaghetti Squash Pizza Casserole

spaghetti squash pizza casserole

Low carb comfort food just got a little more tasty with this gluten free Spaghetti Squash Pizza Casserole! Cooked spaghetti squash meets Italian sausage and marinara sauce. Add your favorite pizza toppings and bake!

Prep Time 20 minutes
Cook Time 35 minutes
Squash Cook Time 35 minutes
Total Time 1 hour 30 minutes

Ingredients

  • 1 large spaghetti squash
  • 1 pound mild Italian sausage
  • 2 cups marinara sauce
  • 1 teaspoon Italian seasoning
  • 3 eggs, whisked
  • ½ cup grated parmesan cheese

Instructions

  1. You can cook the spaghetti squash whole in your microwave, or you can roast it in your oven. 

    To roast spaghetti squash: Cut off the stem part of the squash for easy cutting. Then, cut the squash in half lengthwise and scoop out the seeds.

    Heat your oven to 400°F. Place the squash cut side down on a pan and bake until cooked through, about 35-40 minutes. You’ll be able to tell it’s done when you can easily pierce the squash with a sharp knife.
  2. While the squash is cooking, cook the Italian sausage in a medium sized skillet, breaking into pieces until it’s cooked through. Remove from heat. Drain fat if necessary and return to the pan, then add the marinara sauce and Italian seasoning. Stir to combine and set aside.
  3. . Once your squash is transformed to roasted spaghetti squash, remove it from the oven and flip it over, cut side up, so it can begin to cool.

    Once you can handle it, remove the spaghetti squash strands with a fork and place them in a large bowl. 
  4. . To your spaghetti squash, add the meat sauce mixture, whisked eggs, and parmesan cheese. If there are any toppings you’d like to add, mix those in too. Fold everything together, making sure it’s all mixed. Transfer to an 8x8 or 9x9 casserole dish.
  5. Put the pizza casserole in your oven and bake at 375°F for 35-40 minutes or until the center is set and the sides of the casserole are bubbly.

    Remove from oven and allow to cool slightly before serving. 

Notes

If the squash is really hard to cut, sometimes I’ll microwave it for five minutes or so just to make it a tad softer.

Nutrition Information:

Yield:

6

Serving Size:

1

Amount Per Serving: Calories: 418Total Fat: 27gSaturated Fat: 10gTrans Fat: 0gUnsaturated Fat: 19gCholesterol: 145mgSodium: 1161mgCarbohydrates: 22gFiber: 4gSugar: 10gProtein: 22g

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