Preheat the oven to 350°F (175°C).
Grease a 9×13 inch baking dish with butter or non-stick spray.
Pour both cans of apple pie filling evenly into the bottom of the prepared baking dish.
Sprinkle the entire box of Krusteaz Cinnamon Swirl Cake Mix evenly over the apple pie filling.
Drizzle the melted butter evenly over the cake mix layer.
Bake in the preheated oven for 40 to 45 minutes, or until the top is golden brown and the filling is bubbly.
Remove from the oven and let cool for at least 10 minutes before serving.