1 box white or yellow cake mix
1 can crushed pineapple with juice
1 can blueberry or cherry pie filling
2 sticks of butter

Grease pan 9 by 13 inch with shortening. Open and pour crushed pineapple with juice, open and pour pie filling - swirl with knife. Sprinkle cake mix over top of filling, cut butter in slices (the long way). Lay over cake mix. Bake at 350 degrees for 1 hour.

Serve warm with Cool Whip.