This cookie got its name because a whole 18-ounce jar of peanut butter is used to make it. It is the creamiest, moistest cookie I have ever had, and bound to be a favorite with anyone who makes them. Just don’t over bake them! Posted on August 12, 2022August 12, 2022 by Caitlin Acosta This cookie got its name because a whole 18-ounce jar of peanut butter is used to make it. It is the creamiest, moistest cookie I have ever had, and bound to be a favorite with anyone who makes them. Just don’t over bake them! Advertisement