1 box yellow cake mix
1 can fruit pie filling (I prefer cherry)
1 stick butter

Put pie filling in 9"x12" casserole dish. Sprinkle dry cake mix on top. Slice stick of butter over top of cake mix. Bake at 325 degrees until top is brown.

Serve warm with Cool Whip. (Sometimes I like to use a spice cake mix and apple pie filling.)