Preheat the oven to 375.

Spray a 9x13 inch pan with non-stick spray.

Mix together oats, cake mix, and melted butter until it there is no more dry mix.

Press 1/2 of this mixture evenly into the bottom the prepared pan.

Spread pie filling evenly over the crust.

Sprinkle the remaining oat mixture on the top evenly.

Bake 18-23 minutes or until the top is lightly browned.

Cool before cutting into bars.