The Original Girl Scout Cookie Recipe from · Cream butter and sugar; add well-beaten eggs, then milk, flavoring, flour, and baking powder. Founded on March 12, , Girl Scouts of the USA celebrate their th anniversary this year. They've been selling cookies to finance troop. Naturally, a lot has changed since the first troop started selling homemade butter cookies in In , the Girl Scout organization turned to. Girl Scouts have a great long history. I tracked this recipe down from the Girl Scout official website.