To prepare a warm upside down cheesecakes with pineapple sauce cake recipe, you'll first need to prepare the cake batter. Preheat the oven to 350?F (177?C) and grease and flour two 9-inch springform pans. In the bowl of an electric mixer fitted with the paddle attachment, cream together the butter and sugar until light and fluffy. Add the eggs and vanilla and beat until peaks form. Fold in the flour mixture and mix until just combined. Pour the batter into the pan and bake for 20 to 25 minutes, or until toothpick inserted in center comes out clean. Let cake cool in pan for 10 minutes before removing to wire rack to cool completely.