Abstract: An inner cake pan is removably receivable in an outer pan whose side walls are spaced from the side walls of the inner pan for providing a water receiving space surrounding the inner pan side walls for insulating these walls from the oven heat during the baking of the cake. Novel locking means secures the two pans together so that the bottom of the inner pan contacts the bottom of the outer pan and, therefore, the inner pan bottom will be heated more rapidly than its side walls which are kept at a lower temperature than the bottom because of the insulating layer of water encompassing the inner pan side walls. Also, the releasing of the locking means at the end of the cake baking period will cause the water in the outer pan to float the inner pan and raise it for ready removal from the outer pan.