1 can crushed pineapple, drained
1 can cherry (or blueberry) pie filling
1 box white cake mix
1 stick butter

Pour pineapple into bottom of greased 9"x13" pan. Spoon pie filling over top of pineapple. Sprinkle cake mix over top. Slice butter into squares and lay evenly over mixture. Bake at 350 degrees for 30 to 45 minutes until golden brown.