Guy Fieri visits Sweetie Pie’s in St. Louis to try out the diner’s famous macaroni and cheese. Owner Robbie Montgomery, who opened Sweetie Pie’s in 1997, shares her mac and cheese recipe with Guy. She starts by adding two pounds of Velveeta cheese to elbow macaroni. She then adds one pound each of shredded cheddar cheese and shredded Colby jack cheese. Robbie adds two huge spoons of sour cream to the mix. Guy helps her add butter, margarine, salt, pepper, sugar, five eggs and milk. Robbie whisks everything together and bakes it until the top is melted and brown. Guy digs in and claims that if they got him a stool and a bib, he’d stay there all day.