"Made in a mini muffin tin, these cute little low-carb egg-white frittatas make a perfect portion-controlled buffet or party food...."
INGREDIENTS
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cooking spray
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1/2 cup finely chopped onion
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1 1/2 cups chopped baby spinach
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4 egg whites
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1 egg
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1/4 cup grated reduced-fat Cheddar cheese
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freshly ground black pepper to taste