How do I unbake a cake? You... Can't. Once all the ingredients are mixed up and baked it's permanent-; Ok I'm gonna need you to listen to me very carefully! Put it back in the oven. Set it to the negative of whatever temperature you baked it at, such as -325 degrees and leave it in for the EXACT amount of time you baked it for! It has to be exact, otherwise the flower will turn into wheat and the eggs will turn into a chicken; Don't ask me how. Why do you know these things? I'm gonna try it.