This caramel banana upside-down cake recipe is perfect for Thermomix users. The cake is made with ripe bananas, sugar, eggs, flour, and butter, and is baked in the oven until golden brown. The caramel sauce is made in the Thermomix and is poured over the bananas, which are then placed on top of the cake batter. The result is a delicious and moist cake with a sweet and sticky caramel topping. This recipe is easy to follow and is perfect for those who love the combination of banana and caramel flavors.