Whisk the eggs and sugar, add the oil. Mash and stir in the bananas. Mix the flour and baking powder with the mixture. Add about half a glass of Nutella, a little more or less depending on your preference.
Pour the mixture into a springform pan and bake at 170 ° C (fan oven) for about 45 minutes.
The cake will be incredibly fluffy and juicy. You can also coat it with couverture.