Baking S.O.S. says: Once a cake has cooled completely, it is not a good idea to put it back in the oven. It would take a long time for the internal temperature of the cake to rise enough to finish baking it in the middle. In the process, the rest of the cake would over-bake and become dried out. It’s best to count this as a learning experience and try to do it differently next time.
There are several ways to test for doneness of a cake: 1) Insert a toothpick in the center of the cake. If it comes out clean or with dry crumbs on it, it is done. 2) Gently touch the center of the cake. If it springs back, it is done. If you hear it “squish” a little, it still needs more time. That is the sound of raw batter.
Good luck next time!
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