1 can cherry or blueberry pie filling
1 can crushed pineapple (with juice)
1 box yellow or white cake mix
1 cube butter, melted (could cut in half)

In a 9x13" pan, combine pie filling and pineapple. Sprinkle cake mix over mixture, then spread melted butter over entire cake. Bake at 350 degrees for 35 to 45 minutes.