Preheat the Oven
Preheat your oven to 350°F (175°C).
Grease a 9×13-inch baking dish with butter or nonstick spray.
Layer the Ingredients
Spread the apple pie filling evenly across the bottom of the prepared baking dish.
Sprinkle the dry cake mix over the apple filling, covering it completely.
Arrange the cold butter pats evenly over the top of the cake mix, ensuring most areas are covered.
Bake the Cake
Place the baking dish in the oven and bake for about 1 hour, or until the top is golden brown and the edges are bubbling.
Serve and Enjoy
Let the cake cool slightly for 5-10 minutes.
Scoop into bowls or plates and serve warm with vanilla ice cream or a dollop of whipped cream, if desired.