LORELAI: You made me a Santa burger … He has a hat and everything.
LUKE: Yeah, I just cut a piece of Wonder Bread, you know, poured a little ketchup, piped on a little cream cheese.
Wonder Bread is a brand of bread first produced in the US in 1921. It was one of the first brands to sell bread pre-sliced, and their classic item is a white sandwich loaf. It was owned by Hostess in 2000.