An upside down cake is a single layer cake that bakes in a pan with the toppings placed on the bottom. When the baking is complete, the pan is then turned over onto a cake plate, making what was previously on the bottom the top of the cake. Hence, upside down cake.u003cbr/u003eu003cbr/u003eThe u003ca href=u0022https://joyfullymad.com/pineapple-upside-skillet-cake/u0022 target=u0022_blanku0022 rel=u0022noreferrer noopeneru0022u003ePineapple Upside Down Skillet Cakeu003c/au003e is the most well known upside down cake, but there are so many fun renditions you can try!