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Preheat oven to 400 degrees
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Spray mini muffin pan with non-stick spray or grease the bottoms of the tins with butter
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Whisk the egg whites and divide between the 24 mini muffin cups
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Sprinkle the shredded cheddar cheese over the egg whites
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Bake for 10 minutes or until edges are just starting to brown
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Remove from oven and let cool
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Remove crisps from muffin tins and enjoy