Spaghetti Squash Casserole

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Baked Spaghetti Squash Casserole is an easy, low carb, pasta-like dish that everyone will absolutely love. Cooked spaghetti squash is combined with a quick meat sauce, topped with cheese and baked until golden and bubbly.

Serve this easy dinner alongside a simple caesar salad and crusty bread with Homemade Garlic Butter for the perfect weeknight meal!

Spaghetti Squash Casserole on spoon

Spaghetti Squash Casserole

This low carb spaghetti squash casserole recipe features delicious strands of spaghetti squash (in place of pasta) baked with a quick and flavorful homemade meat sauce. The casserole is topped with cheese and baked until bubbly!

We love to make casseroles during the week! From an Easy Tuna Casserole to unstuffed cabbage roll casserole, they’re an easy versatile meal!

Eating healthier doesn’t mean you need to spend more time or money in the kitchen! This baked spaghetti squash casserole is ready in about 35 minutes, making it the perfect quick dish. We love serving it with a simple side salad as well as some easy dinner rolls to sop up the leftover meat sauce at the end. YUM!

Spaghetti Squash Casserole on white dish

How To Make Spaghetti Squash

Spaghetti Squash is an amazing veggie, a tender squash with strands that resemble everyone’s favorite pasta! The flavor is slightly sweet but not sweet like butternut squash or acorn squash.

Spaghetti Squash can be cooked in the microwave or you can make baked Spaghetti Squash in the oven. Once baked you can run a fork along the squash to create noodle-like strands perfect for soups, stews and of course casseroles like this one!

How to Cut Spaghetti Squash: Spaghetti squash is a very tough squash so I’d recommend poking it with a fork (like you would a baked potato) and microwaving it 3-5 minutes. This will soften the exterior enough for cutting. Cut lengthwise tip to tip and scoop out any seeds before cooking.

Uncooked Spaghetti Squash Casserole

How To Make Squash Casserole

This spaghetti squash casserole is a lower carb take on our favorite Baked Spaghetti recipe! It’s easy to make, can be prepped ahead of time and has just a few simple steps:

  1. Prepare the squash until al dente (roast it, microwave it, it’s up to you)
  2. Prepare the meat sauce in a saucepan
  3. Mix everything together in a casserole dish and top with cheese
  4. Bake until for 20 minutes or until cheese is melted and everything is warm and bubbly

Serve and enjoy, so easy!

Spaghetti Squash Casserole in casserole dish

Can You Freeze Spaghetti Squash Casserole

You bet! This baked casserole freezes amazingly. Just freeze it covered or in a plastic container for up to 3 months.

To reheat, defrost overnight in the fridge and pop it back in the oven until heated through.

If you’re storing it in glass, make sure you allow the glass to come to room temperature before it goes in the oven. Glass can easily shatter if the temperature is changed too quickly.

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Spaghetti Squash Casserole on spoon
4.95 from 97 votes
Review Recipe

Spaghetti Squash Casserole

Prep Time 5 minutes
Cook Time 35 minutes
Total Time 40 minutes
Servings 6 servings
This healthy spaghetti squash casserole recipe features colorful spaghetti squash baked with a quick and flavorful homemade meat sauce. The casserole is topped with cheese and baked until bubbly!


  • 1 spaghetti squash cooked
  • 1 pound lean ground beef
  • 1 onion diced
  • 2 cloves garlic minced
  • 15 ounces diced tomatoes canned
  • 1 tablespoon tomato paste
  • 1 cup marinara sauce or pasta sauce
  • 1 teaspoon Italian seasoning
  • 1 ½ cups mozzarella cheese shredded

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  • Cook squash until tender *see note. Once cooked, use a fork to scrape the strands of spaghetti squash. Remove strands and set aside.
  • Preheat oven to 375F.
  • In a medium saucepan, cook ground beef, onion and garlic until no pink remains. Drain any fat.
  • Add diced tomatoes, tomato paste, pasta sauce and seasoning. Simmer 5 minutes.
  • Stir in squash. Place in a casserole dish (or back into the squash halves) and top with cheese. Bake for 20 minutes or until golden and bubbly.

Recipe Notes

Squash can be baked or microwaved.

Nutrition Information

Calories: 286, Carbohydrates: 19g, Protein: 25g, Fat: 12g, Saturated Fat: 4g, Cholesterol: 56mg, Sodium: 530mg, Potassium: 748mg, Fiber: 4g, Sugar: 9g, Vitamin A: 630IU, Vitamin C: 15.1mg, Calcium: 358mg, Iron: 3.5mg

(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)

Course Casserole, Dinner, Entree, Main Course
Cuisine American

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Holly is a wine and cheese lover, recipe creator, shopping enthusiast and self appointed foodie. Her greatest passion is creating in the kitchen and making deliciously comforting recipes for the everyday home cook!

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Recipe Rating


  1. We are vegetarian and substituted Morningstar crumbles instead of the ground beef! so great! The kids even ate it!5 stars

  2. Made this last night, and I couldn’t stop eating it!! I substituted hot sausage for the ground beef and added a green bell pepper. Kept everything else the same. What an easy, flavorful dish! Will definitely be making this one again!!5 stars

      1. Used ground turkey and added half a red bell pepper, with a dash of red pepper flakes. I had a very large squash so couldn’t fit it in pan with meat. IN a 13×9” pan, I layered squash, ricotta and the meat sauce, then topped with cheese and baked. Delicious!!

  3. Used ground chicken instead of beef and also put ricotta on top before adding mozzarella. My husband loved it.5 stars

  4. Do you know what calorie count would be if using ground turkey instead of beef? Husband can’t eat beef. Thanks.

    1. The calories would be reduced by approximately 30 calories per serving. Enjoy the recipe Sue!

  5. My family loves this receipe. Even my picky no veggie kid goes back for seconds and thirds. Lol. We never have any leftovers to refrigerate. It is a forgiving receipe.5 stars

  6. Incredible! Added chopped red and green peppers! Used 100% ground sirloin, so healthy and so delicious. Winner in my hubby’s eyes! Picture perfect with chopped parsley on top after browning cheese in broiler. Wish I could post a picture!!!5 stars