Sour cream, pudding, I've also used the cake extender recipe from here .. which is an additional egg, flour, sugar and flavoring I believe... there's so many things you can add to cake mixes.... Misdawn uses a tub of icing in hers and says it makes it very moist ... some like the Cake Mix Doctor's book, others don't ... I like it because it gives you the measurements for all the extra ingredients needed to "doctor" the cake mix up w/o have to experiment to see if it will work
