"The perfect appetizer with Champagne...."
INGREDIENTS
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1 sheet frozen puff pastry (half of 17.3-ounce package), thawed
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4 ounces thinly sliced prosciutto
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2 tablespoons chopped fresh basil
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3/4 cup (packed) finely grated Gruyère cheese (about 2 1/2 ounces)
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1 egg, beaten to blend