Observed on June 12 in the USA, this food holiday celebrates a cookie popular since the early 1900s when it was first published as a recipe by George Washington Carver and promoted by the Tuskegee Institute in a peanut cookbook "How to Grow the Peanut and 105 Ways of Preparing it for Human Consumption." Early peanut butter cookies were made with chopped peanuts; soft peanut butter was added to the cookie recipes in the 1930s.