Sweet Apple Cinnamon Empanadas

Name: Sweet Apple Cinnamon Empanadas
Ingredients: For the Pastry:; 2 1/3 cups all-purpose flour; 1 teaspoon salt; 1 tablespoon sugar; 1 cup (2 sticks) butter (chilled and cut into 1 tablespoon pieces); 8 ounces cream cheese (chilled and cut into pieces); 1 teaspoon vanilla extract; For the Filling:; 4 to 5 firm green apples (like Granny Smith); 2 tablespoons butter; 1/2 cup sugar; 1/4 cup brown sugar; Pinch of salt; 1 to 2 teaspoons cinnamon; 2 tablespoons cornstarch; Optional: 3 tablespoons dulce de leche; For Baking:; 1 egg yolk; 1/2 cup sugar (for sprinkling; as needed)