This recipe for chocolate banana cake in the Thermomix is perfect for those who love the combination of chocolate and bananas. Made with cocoa powder and chocolate chips, this cake is rich and decadent. The recipe calls for ripe bananas, which are mashed and mixed with the other ingredients in the Thermomix. The mixture is then poured into a cake tin and baked in the oven until golden brown. Serve with a scoop of vanilla ice cream or a drizzle of chocolate sauce for a delicious chocolatey treat.