There are only a few ingredients in this slow cooker spaghetti squash casserole recipe. This healthy, low-carb alternative to spaghetti cooks in just a couple of hours time.

Slow Cooker Spaghetti Squash Pizza Casserole (Low-Carb)

  • Author: Fit SlowCooker Queen
  • Prep Time: 5 mins
  • Cook Time: 2 hours
  • Total Time: 2 hours 5 mins
  • Yield: serves 4 1x


  • 1 medium size spaghetti squash, COOKED (approx 2 lbs)
  • 15 ounces diced tomatoes
  • 2 cups mozzarella cheese, shredded
  • 1 1/2 tbsp Italian or pizza seasoning
  • 2 garlic cloves, minced
  • 1/2 tsp salt
  • 5 ounces topping of your choice (pepperoni, sausage, etc)


  1. Shred spaghetti squash with fork and add to a large bowl along with diced tomatoes, salt, seasoning, and garlic.
  2. Spray slow cooker generously with cooking spray and add spaghetti squash mixture.
  3. Top with cheese and whatever additional toppings you’re using.
  4. Cook HIGH 1-2 hours or LOW 2-4.


Nutritional value calculated using 5 ounces of pepperoni.