I already apologise for the bad lighting on the pictures, but I just tend to take pictures at night, because I have more time then, so don't hate me for that (:
To make the dough, you basically just have to mix all the ingredients, but in the recipe it said that it is recommended to make some kind of whole in the already mixed flour, butter, sugar & baking powder and then put the egg into that whole. I honestly don't have a clue why this would affect the dough, but maybe it does have a decent reason, haha (: You then have to bake it with 180°C for I think about 25 minutes it was, but you should better keep an eye on it, because it obviously depends on the baking thing you use and on your oven. If you put a metal or wooden stick in for a second and then put it out again and there are no crumbs on it, the dough is ready, but if there are you might want to bake it for another couple of minutes.
This is what my cake looked like with melted chocolate put on the bananas. You might want to leave your cake in the fridge, so the chocolate gets hard and the bananas don't get bad :)
The cake tasted delicious, I genuinely loved it and I am sure I will make it again soon :) I hope you liked my recipe!