It's possible you're thinking of:
* The Devil in the "Kraft Singles" commercial: This commercial featured a devil-like character who was trying to convince people to eat something other than Kraft Singles. It was a very popular commercial in the 1980s and early 1990s. The actor who played this character was James Earl Jones.
* The Devil in other food commercials: Many food commercials throughout the years have used devilish characters to represent unhealthy choices.
If you can provide more context or details about the specific "Kraft Devil" you're referring to, I may be able to give a more accurate answer.