Spaghetti Squash Au Gratin
Ingredients:
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1 spaghetti squash, halved and seeded
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3 tablespoons light margarine
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1 small yellow onion, thinly sliced
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1 teaspoon red pepper flakes
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¼ teaspoon garlic powder
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salt and freshly ground black pepper to taste
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¾ cup fat-free sour cream
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1 cup shredded light Cheddar cheese
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cooking spray