In the episode entitled "Crème Fraiche," Stan's father, Randy, has a titillating obsession for cooking shows and decides he wants to be come a chef. In order to snap his Dad back into reality, Stan gets Cartman to dress up at Ramsay to convince Randy that he doesn't have what it takes during a mock cooking show. His portrayal is so hilariously spot-on that a camera crew comes to South Park to film the "Hell's Kitchen Nightmares Iron Top Chef Cafeteria Throwdown Ultimate Cookoff Challenge."
As for Oliver, South Park draws from the English chef's Food Revolution show on ABC, which examines and rehauls various school lunch programs across the U.S. After all, Oliver's mission is only to make this country "healfy".
WARNING: Some content is NSFW
"Oh My God, It's Gordon Ramsay!!":
"Can I Just Get Some Tater Tots?":
"Heavyweight Culinary Battle":
What do you think about Gordon Ramsay and Jamie Oliver's inclusion on South Park?