INGREDIENTS
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1 sheet of frozen puff pastry, defrosted per package instructions (such as Pepperidge Farms)
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1/4 cup shredded 2% Mozzarella cheese
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16 turkey pepperoni slices, diced
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1/4 cup diced white mushrooms
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1/4 cup pizza sauce
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1/2 teaspoon Italian seasoning, divided
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1 egg*
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1 tablespoon water