Spray a 9x13 pan with non stick spray.
Put both cans of pie filling in the pan and stir together.
Take the box of cake mix and cut the corner off of the bag. Sprinkle it over the top to completely cover the pie filling.
Cut the 2 sticks of butter into cubes and dot over the top of the cake mix.
Bake at 350 degrees until crust is crispy and brown, approximately 20 minutes.