Grandma's cookies are thin cookies with chocolate chips inside.
Role in series
Grandma's cookies in the episode "Grandma's Kisses." They are first seen when SpongeBob goes to his grandma's house to receive gifts and it is revealed that he absolutely loves her cookies. He also dips them in milk sometimes and licks the cookie dough off the spoon.
Later in the episode, when SpongeBob choses to act like an adult as a result of Squidward and the Krusty Krab's customers making fun of his grandma's kiss on his forehead, Patrick decides to take SpongeBob's place as the child Grandma feeds these cookies, and he loves them as much as his best friend does, even wearing a special hat to eat them. SpongeBob becomes jealous and wants affection from his grandmother again and for her to feed him cookies, which she does after telling him he doesn't have to act like a grownup no matter what others say.
SpongeBob's grandma has also made gingerbread cookies, which are seen in the episode "BlackJack."