I'm making one for my FIL later today - got the idea from allrecipes.com and tweaked it a bit. Mash 4 bananas, mix with 1-2 eggs, a drizzle of oil, and any kind of cake mix - I used a carrot cake mix before and it was amazing. Bake as usual. For the frosting - beat together 8oz cream cheese, 4oz butter (real butter), 2 cups powdered sugar, and a bit of vanilla if you want. Rich but not horridly sweet like most frostings. Sooooo good, and not a sweet cake - yes there's the natural sugar in the bananas, and the sugar in the mix, but it's more rich than sweet.
at 12:18 PM on Oct. 9, 2010