Since the cook has a day off (she's getting her spatulas sparkled), Dorothy decides to teach Ozma how to bake her famous chocolate chip cookies. Ozma's ignorance about anything having to do with a kitchen causes her to replace the vanilla with the potion of life, however, which causes the mixer to come to life. Full of magic, the mixer starts mixing things up, including the legs of Toto, the Scarecrow, the Tin Man, and the Lion. (Toto walking around on the Tin Man's legs is very cute.) The mixer then heads out into the countryside and eventually towards Wilhelmina's castle, but Wilhelmina steers it back towards the Emerald City. Using the Ruby Slippers, Dorothy and the guys get back before the mixer, where Ozma's mirror gives Dorothy an idea. She confronts the mixer, and uses the mirror to reverse the Potion of Life (P. O. L.) into a Liquid of Petrification (L. O. P.), stopping the mixer and undoing all of its mixups. Dorothy then shows Ozma something simpler to make in the kitchen, but Ozma goes a little overboard and fills the kitchen with toast.
This story really didn't need Wilhelmina, Frank, and Lyman, as they really don't contribute much, although Lyman gets in an interesting mixup. The big takeaway for me is the validation of my childhood mislabeling of the Liquid of Petrifaction. Yes, for several decades I thought it was the Liquid of Petrification. So now at least my name for it is somewhere out there, even if it isn't canon. Also, Dorothy and Ozma are really cute in their oversized chef hats (which Dorothy keeps wearing through the whole episode, for some reason).