As requested by some, here is the recipe for the Chocolate Banana Cake.
I added an extra ingredient, 1 tsp of bicarb as i have problems when using so much liquid in a recipe.
You can either slice or mash up the banana if you prefer.
I didn't have any rice flour so ignored it. I didn't have any soy milk so used regular milk instead. Finally i didn't have any dark cocoa powder so used regular cocoa powder but do not use hot chocolate powder, it wont work too well.