Magic Muffin

The Magic Muffin is a special wish granting muffin that can grant wishes that are free of Da Rules. Whenever a godchild has kept his fairy godparents for over a year without revealing their secret, they may get this special gift as a present.

Abra-Catastrophe!
Timmy Turner was given this muffin by Cosmo and Wanda on the one year anniversary of meeting his godparents. However, the muffin falls into the hands of Bippy the Monkey who wishes for a world ruled by apes. Timmy cannot revert the wish because fairies now serve the dominant species on Earth, monkeys. He finally manages to "trick" Bippy (or more specifically, Cosmo) into unwishing the wish. The muffin is used again by Crocker who wishes to catch a fairy, and then catches Wanda and uses her magic to take over the world.

Wishology
The muffin briefly appeared again in Wishology, but this time Timmy knows not to risk using it.