Nutella birthday cake

My daughter turned 5 yesterday, I had promised her a cake, and on the weekend and Monday I was too busy working on a translation, so what I did in the end was experiment, throw ingredients together having in mind several recipes. What mattered for my daughter in the end was how the cake was decorated - and for the lack of time I just designed her favourite cartoon character with whipped cream and coloured food gel. But the cake turned out to be good, and I made a couple of mini cupcakes, too.