This recipe is perfect for those who want to make a cake in a hurry. The cake is made with flour, sugar, baking powder, salt, milk, oil, vanilla extract, and a ripe banana. Mix the dry ingredients in a mug and add the wet ingredients. Mix until well combined and microwave for 1-2 minutes. While the cake is cooking, make the caramel sauce by melting butter and brown sugar in a saucepan. Pour the caramel sauce over the cake and serve warm. The result is a delicious and satisfying cake that is perfect for a quick dessert.