Spoon apple or cherry pie filling in 8x10 cake pan. Sprinkle dry cake mix over top. Cover completely.
Melt butter in saucepan or microwave. Spoon over entire top of cake mix. Spread with butter knife gently.
Bake in a 350 degree oven untill browned, about 20 to 25 minutes.
Let completely cool.
Can be served with cool whip or vanilla ice cream on top.