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In a medium skillet, saute sausage and onion. Cook through and drain.
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Heat oven to 350F degrees.
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Spray 12 cup muffin tin with cooking spray. Add even amounts of spinach to each cup. Repeat with sausage/onion mixture. Fill each cup with egg whites. Top with cheese.
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Bake for 15-17 minutes. Allow to cool for 5 minutes before removing carefully from each cup.