For the Chai Kisses Banana Cake, cream together room-warm butter, oil, sugar, chai kisses spice and vanilla sugar. Then add the egg and continue to beat until fluffy. Mash banana or mash with a fork and stir into the mixture.
Mix flour with baking powder and finally stir a good dash of rum into the mixture to make a smooth dough. Pour the dough into a small buttered and floured baking pan. Preheat the oven to 180°C and bake the Chai Küsschen Banana Cake at upper-lower heat for about 45 minutes, depending on the oven.