The phrase "Who made the potato salad?" is best known as the title of a 2006 urban romantic comedy film directed and written by Damon "Coke" Daniels. The movie stars Jaleel White and Jennia Fredrique. It is about a San Diego policeman who travels to Los Angeles with his fiancée to meet her dysfunctional family and announce their engagement. The question "who made the potato salad?" itself is not about a literal potato salad maker but is the film's title and part of its storyline context.
If the inquiry is about an actual potato salad recipe or event, there appears to be no widely known specific individual famously attributed to making a particular potato salad, outside of personal or local contexts. The phrase is mostly recognized in relation to the film. So, the answer to "who made the potato salad?" in a broad cultural sense is related to the film "Who Made the Potatoe Salad?" directed by Damon "Coke" Daniels.
