Mel gets a call at his Fix it shop, to repair an oven at the Y. After some jokes about confusing the YMCA for the YWCA, he is on the job. Once there, cake baking classes are in session with a prize and public honors for the best of the class.
The teacher apparently didn’t get the memo about the broken oven and assumes Mel is part of the class. He fakes his way through, but when he wins, he has to get rid of his nonstandard and inedible cake.