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Spaghetti Squash Casserole Recipe

This Spaghetti Squash Casserole with chicken and shredded cheese is the perfect weeknight meal. Made with roasted spaghetti squash, this casserole is easy to make, low carb, gluten-free, and I’ll bet that everyone in your family will be reaching for seconds!
Course dinner, Main Course
Cuisine American
Keyword casserole, Roasted Spaghetti Squash, Spaghetti Squash
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Servings 6 people
Calories 367kcal

Ingredients

For the Spaghetti Squash

For the sauce

  • 1 tbsp olive oil
  • ½ cup red onions chopped
  • 2 garlic cloves minced
  • 3 cups cooked shredded chicken breast— skinless
  • 1 cup store-bought spaghetti sauce or homemade tomato sauce
  • 1 ½ cups shredded mozzarella

Instructions

For the Spaghetti Squash:

  • Preheat oven to 400F.
  • Halve the spaghetti squash with a sharp knife and using a spoon, remove seeds.
  • Pour over olive oil on the inside of the spaghetti squash and season with salt and black pepper to taste.
  • Place spaghetti squash cut-side down on the baking sheet and roast in oven on middle rack for about 40-50 minutes. The time will depend on the size of the spaghetti squash.
  • Remove from oven and let cool slightly.
  • Using a fork, gently remove spaghetti squash strands from the squash and set aside.

For the Sauce

  • In a cast iron skillet 10”, heat olive oil over medium-high heat.
  • Add onions and garlic and cook for about 3 minutes.
  • Add cooked chicken and tomato sauce to the skillet, mix everything together to combine and cook for 1 minute. Add the spaghetti squash strands and mix all to combine.
  • In a casserole dish, place the spaghetti squash/chicken/tomato sauce mixture and top with mozzarella cheese. Bake for 10 minutes or until golden and bubbly.

Notes

  • If when you run your fork over the squash and you don't get "noodle strands," then let the squash roast longer.
  • See my how to cook spaghetti squash post on cooking the squash with a different method. 
  • Shredding your own cheese makes quite a difference as it melts better.
  • To store: Leftovers can be stored for up to 5 days in the fridge in an airtight container. 
  • To reheat: You can bake or microwave the leftovers to reheat.
  • To freeze: Tightly wrap up the casserole and freeze for up to 3 months. 

Nutrition

Serving: 1/6 | Calories: 367kcal | Carbohydrates: 12g | Protein: 42g | Fat: 17g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 7g | Cholesterol: 105mg | Sodium: 1218mg | Potassium: 406mg | Fiber: 4g | Sugar: 7g