Mix in the eggs and sugar until frothy, then stir in the kitchen-warm butter. Mash the banana with a fork and stir in the banana pulp alternating with flour / baking powder and ground almonds.
Put the dough in a greased bundt cake pan and bake in a preheated oven at 175 ° for 50-60 minutes (chopstick test).
Let the Gugelhupf cool, turn it out and decorate with icing, glaze or powdered sugar as you like.