Cookies are one of the most portable treats. They are easy to make and easier to eat, so they are a favorite for home bakers everywhere. These days there are hundreds of variations of cookie, but there is always something uniquely delicious about enjoying them in their simplest form: the sugar cookie. It can be iced or topped with sprinkles, but if you add any extra flavors into the dough, it’s no longer a sugar cookie. Sugar Cookie Day celebrates the plain sugar cookie, defined by its lack of any specific extra flavors in the cookie itself.