Spaghetti Squash Au Gratin Recipe

Ingredients

• 1 spaghetti squash, halved and seeded
• 3 tablespoons light margarine
• 1 small yellow onion, thinly sliced
• 1 teaspoon red pepper flakes
• 0.25 teaspoon garlic powder
• salt and freshly ground black pepper to taste
• 0.75 cup fat-free sour cream
• 1 cup shredded light Cheddar cheese
• cooking spray