Apples are a fall staple. So this homemade Caramel Apple Upside Down Cake is perfect for the season. With a homemade Cinnamon Caramel Sauce, sliced apples and a flavorful cake poured on top. Once baked, the cake is immediately flipped over for the remaining caramel sauce to oooze down the sides of the cake with the baked apples now displaying on top, hence the upside-down name.