INGREDIENTS
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1/2 (17.3-ounce) package frozen puff pastry, thawed
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1 tablespoon butter
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2 apples, cored, peeled, and diced
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1/4 cup plus 1 tablespoon sugar, divided
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1 teaspoon ground cinnamon
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1 teaspoon cornstarch
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1 egg white
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1 tablespoon water