Step 1

Preheat the oven to 350°F and spray a 9x13-inch baking dish with cooking spray.

Step 2

Pour the apple pie filling into the baking dish.

Step 3

In a medium bowl, combine the cake mix and oatmeal and then sprinkle it over the pie filling.

Step 4

Pour the melted butter over the top of the cake and oatmeal mixture as evenly as possible. Bake the cake for 40 to 50 minutes. The top of the cake should be slightly crisp and golden brown.