This is a recipe that I have adapted from bethm3883 who submitted the recipe on this site for American-style jumbo peanut butter muffins. So it really is thanks to her that this cake lives! This produces a really dense, moist chocolate cake with a lovely peanutty banana taste. Throw what you like in it! I always add chocolate chips and fudgy pieces in mine!
Taste your cake mixture. Because its the only way I can tell if you need to add something else to it.
This really is hard to get wrong. The only part that can go wrong is baking it. Remember, when you take a cake out the oven, it is still cooking as it cools. So if you're skewer has a 'bit' of wetness on it, it isn't the end of the world.
Don't for the love of all things sane, bang the cake tin down on the side when you take it out the oven. You will kill your cake.
Tweak the heck out of this recipe. Maybe someone else can create something oresome from this!