"These flaky, cheesy appetizers are the perfect addition to any occasion...."
INGREDIENTS
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1 large egg
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1/4 cup grated Parmesan
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1/2 teaspoon mustard powder
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1/4 teaspoon salt
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1/8 teaspoon cayenne pepper
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All-purpose flour, for rolling
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1 sheet frozen puff pastry (from a 17.3-ounce box), thawed