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An upside-down cake is a cake that is baked "upside-down" in a single pan, with its toppings at the bottom of the pan. When removed from the oven, the finished upside-down preparation is flipped over and de-panned onto a serving plate, thus "righting" it, and serving it right-side up. An upside-down cake is a cake that is baked "upside-down" in a single pan—usually a skillet—with the eventual toppings placed in the bottom of the pan. When removed from the oven, the finished upside-down preparation is flipped over and de-panned onto a serving plate. Flipping the cake before serving puts the right-side up, so that the ingredients that were in the bottom of the pan are the toppings. Usually chopped or sliced fruits—such as apples, cherries, peaches, or pineapples—butter, and sugar are placed on the bottom of the pan before the batter is poured in, so that they form a baked-on topping after the cake is inverted. A simple cottage pudding cake batter may be used. The first American recipes for upside-down cake, using prunes, appeared in newspapers in 1923.

Source: Wikipedia