1 box vanilla cake mix
1 can cherry or blueberry pie filling
1 can crushed pineapple (can should be the same size as pie filling)
2 sticks butter

In 11 x 14 x 2 baking pan, spread pineapple on bottom, pie filling over pineapple. Sprinkle unmixed cake over. Cut butter into squares and place over cake mix. Bake at 350 degrees until brown on top.