INGREDIENTS
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1 sheet (14 ounces) frozen puff pastry, defrosted overnight in the refrigerator
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Flour, for dusting
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1 large egg
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1 tablespoon water
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Pinch cayenne pepper
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1/2 teaspoon dry mustard powder
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1 cup (3-1/2 ounces) grated gruyère cheese
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2 teaspoons minced thyme
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2 teaspoons minced rosemary
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1/2 teaspoon kosher salt