Spaghetti Squash Au Gratin


This recipe is quick to prepare and a great alternative for a lower-carbohydrate, lower-calorie option in place of a potato side dish. My husband is a meat-and-potatoes kind of guy and even he loved this recipe.

close up view of Spaghetti Squash Au Gratin on a plate
Prep Time:
15 mins
Cook Time:
30 mins
Total Time:
45 mins
6 servings


  • 1 spaghetti squash, halved and seeded

  • 3 tablespoons light margarine

  • 1 small yellow onion, thinly sliced

  • 1 teaspoon red pepper flakes

  • ¼ teaspoon garlic powder

  • salt and freshly ground black pepper to taste

  • ¾ cup fat-free sour cream

  • 1 cup shredded light Cheddar cheese

  • cooking spray


  1. Place spaghetti squash in a covered dish and add 1/4 inch of water. Microwave for 10 to 12 minutes. Scrape insides of squash with a fork and transfer to a small bowl.

  2. Heat margarine in a medium skillet over medium heat while spaghetti squash is cooking and cook onion, red pepper flakes, garlic powder, salt, and pepper until the onion is browned, 5 to 10 minutes.

  3. Preheat the oven to 375 degrees F (190 degrees C). Grease a baking dish with nonstick cooking spray.

  4. Mix spaghetti squash, onion mixture, sour cream, and 1/2 of the Cheddar cheese together. Transfer to the prepared baking dish and top with remaining Cheddar cheese.

  5. Bake in the preheated oven for 20 to 25 minutes. Turn on broiler for the last 2 to 3 minutes and broil until gratin is golden brown on top.

Cook's Note:

This is a great way to encourage your kids to eat more vegetables, although you may want to use a touch less red pepper flakes when preparing for them to lessen the spicy heat as it does have a bit of a kick to it.

Nutrition Facts (per serving)

115 Calories
5g Fat
11g Carbs
8g Protein
Nutrition Facts
Servings Per Recipe 6
Calories 115
% Daily Value *
Total Fat 5g 6%
Saturated Fat 2g 9%
Cholesterol 10mg 3%
Sodium 265mg 12%
Total Carbohydrate 11g 4%
Dietary Fiber 0g 1%
Total Sugars 4g
Protein 8g
Vitamin C 3mg 14%
Calcium 170mg 13%
Iron 0mg 2%
Potassium 117mg 2%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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