"I don't care if you don't want to be the burnt toast, just roll the dice!" -Mung Dall, "The Cinnamini Monster
Toast didn't ever appear as food, but it appeared as a game piece in the episode "The Cinnamini Monster". Mung Daal, Chowder and Snitzel needed to win the Cinnamini Monster at a board game, and Snitzel used the burnt toast. Toast is one of the real world foods that appears in Marzipan City.