There are sugar free cake mixes I think they are Pillsbury. They have Chocolate, Yellow and brownies. Surprisingly they are very good. I use a Yellow mix. Use a 9x13 inch pan. Use about 1/2 stick of butter , sprinkle the Splenda brown sugar over it. Drain a large can of crushed, chunks or round pineapple, then put over the brown sugar mixture. Put cake prepared like it says on box over and bake. It will take a little longer to bake. I sometimes use the juice from the pineapple and substitute for water in the cake mix. Liby also has pineapple with splenda.