Read more: Leaked documents reveal that McDonald's is about to slash items from its late-night menuRead more: Dunkin' execs reveal why they want customers to 'order through a robot' in the near futureRead more: Chipotle is adding new menu items to win over vegan and vegetarian customers, using an ingredient the CEO says 'nobody' knows aboutRead more: Starbucks is reimagining the core belief that turned the chain into a $88 billion juggernautRead more: Brownies, cheese sauce, and guacamole: 7 cult-favorite Chick-fil-A menu items that are almost impossible to find