This classic pineapple upside-down cake recipe is made easy with the help of a food processor. The cake batter is made by combining flour, sugar, baking powder, salt, butter, eggs, and milk in the food processor. The pineapple topping is made by melting butter and brown sugar in a skillet, then adding pineapple rings and maraschino cherries. The cake batter is poured over the pineapple topping and baked until golden brown. The result is a deliciously moist and sweet cake with a caramelized pineapple topping.