McDonald’s 50-Cent Double Cheeseburgers 🍔 | One-Day Deal via Appbr Description:br Get ready for seriously cheesy savings! For National Cheeseburger Day (Sept. 18, 2025), McDonald’s is offering its Double Cheeseburger for just 50 cents — but only through the McDonald’s app and for one day only. Two beef patties, American cheese, onions, pickles, ketchup, and mustard make this classic hard to resist. One burger per customer, participating locations only.