Paper Patties look similar to regular Krabby Patties, but they are flat. They each have a patty, lettuce, and cheese. It is topped with a sesame seed bun, same as a regular Krabby Patty. The only way to make Paper Patties is to type in the order: "1 Krabby Patty" into a computer connected to a printer with colored ink, and then a Paper Patty comes out.
These were created when SpongeBob was yelled at by Squidward for being "strange." Here's what happened: SpongeBob was running around and, as Squidward put it, "Screaming like a banshee!" Squidward told SpongeBob to be normal, and SpongeBob watched a movie on how to be normal. After watching it, SpongeBob made some physical and mental changes. He lost his curves on the edges and his holes (These return at the end of the episode.) He also bought a cubicle and printer at the Krusty Krab.
It took the customers a while to realize the patties were made of paper, which should not have been hard to notice.