According to Mental Floss, the genesis story behind the bushy eyebrowed muppet with his endearing Swedish-gibberish accent ("Yom-yom-yommm, mit de chocolad!") and wooden spatulas:
Swedish Chef Lars “Kuprik” Bäckman claims he was the inspiration for the Swedish Chef. He was on Good Morning America, he says, and caught Jim Henson’s eye. Henson supposedly bought the rights to the Good Morning America recording and created the Swedish Chef (who DOES have a real name, but it’s not understandable). One of the Muppet writers, Jerry Juhl, says that in all of the years of working with Jim Henson on the Swedish Chef, he never heard that the character was based on a real person.
Every year during the Muppets Christmas reruns time, we are reminded of the Swedish Chef and all his glory. My favorite moment in Swedish Chef history is when he uses his "boom-boom" shooting tactic to make donuts from muffins: "See de moofin? Und here mit de boome shooten!"