Apple Cinnamon Kringle Recipe

Name: Apple Cinnamon Kringle Recipe
Ingredients: For the Kringle:; 1/2 cup sour cream; 3/4 teaspoon vanilla; 1 cup (4.5 ounces) all-purpose flour; 8 tablespoons unsalted butter, chilled and cut into 1 tablespoon chunks; 1 egg; 1 tablespoon sugar; For the Kringle Filling:; 4 tablespoons unsalted butter; 2 medium apples, diced; 2 tablespoons sugar; 1/2 teaspoon ground cinnamon; 1 teaspoon vanilla extract; 1 teaspoon cornstarch; For the Kringle Icing:; 1/2 cup powdered sugar; 1/2 tablespoon milk; 1/2 teaspoon vanilla