Described as a "bold new beverage concept from the McDonald’s universe", CosMc's took off with as much fanfare as a SpaceX rocket launch, attracting long lines at the initial fl

McDonald's launched the first CosMc's in December 2023, before rolling out further locations in a "10-store test." The initiative was viewed as a way for McDonald's to capture some market share from competitors such as Starbucks and Dunkin'.