The Sponge Patty is an inedible variation of the Krabby Patty that has two light pink kitchen sponges used instead of bread buns. Other ingredients include an aluminum brush for the patty, lime-green soap as the special sauce, and mop strings as the lettuce.
Role in episode
SpongeBob accidentally creates the Sponge Patty after Plankton, who is inside his head, removes his eyes. Plankton's plan is to see how SpongeBob makes a Krabby Patty right with his own eyes, but does not realize that SpongeBob cannot make a Krabby Patty blind.
After SpongeBob constructs the Sponge Patty and hands it to the customer, Plankton plugs SpongeBob's eyes back in and he is horrified to see the disgusting Krabby Patty alteration that he made, then running to Mr. Krabs' office for reassurance on how to properly make Krabby Patties.