I looked all over for the recipe you are talking about. I have the book with the school bus in it and I remember seeing a pencil in it. I finally found my book, and the thing I thought was a cake is really pencil cookies. I'm not sure if this is what you are talking about, but I found the recipe on the web if you need it. Good Luck!
http://pillsbury.com/recipeSearch/sh...recipeID=24414