The Cookbook is an item that appears in the Paper Mario Series. It is usually given to the chef of the game so that they are able to cook multiple items together, so that new items can be created. It would make its first appearance in Paper Mario after being found in Shy Guy's Toy Box when it was stolen by a Shy Guy in Chapter 4. Mario would need to give Gourmet Guy the Cake so that he will rocket out of the area and drop the Cookbook so Mario could give it to Tayce T.
It would return in Paper Mario: The Thousand-Year Door where it could be found in Creepy Steeple. Mario would need to roll into a small hole near the entrance to Creepy Steeple and then he will be able to pass it onto Zess T. after she has asked for it during the "Seeking Legendary Book!" trouble.