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2/3 cup sugar 1 teaspoon ground cinnamon 2 tablespoons all-purpose flour ½ teaspoon kosher salt 1 (14.1-ounce) package of refrigerated pie dough Cooking spray 6 cups (¼ inch thick) slices Empire apple (two pounds) 1 large egg, beaten 1 tablespoon water Preheat oven to 425 degrees.