INGREDIENTS
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1 pint fresh blueberries
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4 teaspoons cornstarch
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1/3 cup granulated sugar
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2 sheets puff pastry, thawed
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1 egg whisked with 2 teaspoons water
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4 ounces cream cheese, softened
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1 1/4 cups confectioners' sugar
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1 teaspoon finely grated lemon zest + 1 tablespoon lemon juice
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1/2 teaspoon clear vanilla extract