Who wrote Only in America do people order double cheeseburgers large fries and a diet coke?

The phrase "Only in America do people order double cheeseburgers large fries and a Diet Coke" is from the comedian and actor Jay Leno. He used it as part of his stand-up routine to humorously comment on American culture and dietary habits. Leno often highlighted the contradictions and quirks of American life in his comedy.