Photo by Justin Sullivan/Getty Images I think this might become my favorite day of the year. March 6th is nationally recognized as OREO Cookie Day, marking the fact that on this day back in 1912, the first OREO Cookies were sold. To date, nearly 111 years later, there have been 500 billion purchased. To celebrate, I took to Instagram to gather a few desserts you can make tonight with OREOs in observance of this very important day.