Chicken Sandwich Wars Bring New Supply And Demand Struggles To KFC, McDonald's 04/28/21 AT 5:47 PM Both KFC and McDonalds had a late start to the Chicken Sandwich Wars, but the demand for their sandwiches has skyrocketed since their releases and the restaurants are having to keep up with the hefty supply. KFC happens to be selling twice the volume of their new creation in comparison to its past versions, according to Yum Brands, per CNBC. It debuted its sandwich in February of this year. The quarter-pound, all-white meat, double-breaded chicken breast filet that’s situated between a buttery brioche bun with crispy pickles and Colonel’s real mayo is flying out the restaurant’s doors and even has created repeat customers.