Made one last night. About 10 mins assy time.

1 stick butter
1-1/2 C brown sugar
1 can pineapple slices (20oz - 10 slices)
1 jar maraschino cherries (opt)
1 box cake mix --I used lemon

In bottom of 12x9 inch baking pan, melt the butter. Evenly sprinkle
brown sugar over melted butter. Layer pineapple slices over brown
sugar (2 rows of 4 longways), cutting two slices in half to put down
the long side of pan. Add cherries. Pour mixed cake batter over all.
Bake 375F for 45 mins. Remove, cool, flip, enjoy. Piece of cake!

nb