ATLANTA--(BUSINESS WIRE)--More than 40 years ago, Popeyes® Louisiana Kitchen founder, Al Copeland, introduced the Popeyes Buttermilk Biscuit, a superior take on a southern classic. Today, the now legendary Buttermilk Biscuit inspires devout admiration expressed in every forum available from in-restaurant comments to social media posts. This week, Popeyes will honor that tradition, celebrating National Biscuit Day as only Popeyes can. Guests will receive a FREE biscuit with purchase on National