Doofy O's

Doofy O's is the cereal made by Doofy The Dragon. It first appeared in Bowser Junior Goes To Disney World! as a contest. The contest was to find a knife in one of the boxes, and Bowser Junior won the contest. It also appeared in Bowser Junior's 1st Grade! Part 5, and it is revealed that Principal Steinbeck liked them and they've been around for a while.