McDonald’s Is Celebrating , National Cheeseburger Day , With 50-Cent Double Cheeseburgers.br In honor of National Cheeseburger Day,br McDonald’s is offering its Double Cheeseburger br for just 50 cents on the McDonald's app.br The Double Cheeseburger was added to the br menu in 1965 after only appearing as a br promotional item in the United States.br To get the cheeseburger, customers must br download the McDonald’s app and sign up br for the MyMcDonald’s Rewards program.br From there, customers will be ablebr to order their $.50 cheeseburger.br The promotion comes as the br fast-food chain continues to br push its recently-launched br MyMcDonald’s Rewards program. .br Since the offer is to encourage customers br to download the app, the deal is br only available to first-time users.br It can also only be used one time, br meaning one burger per customer.