McDonald's said Tuesday that it is doubling down on breakfast by introducing bagel sandwiches nationwide to celebrate the Egg McMuffin's 50th anniversary. Why it matters: Breakfast is big business for fast-food chains and expanding menus can boost morning sales.

McDonald's has brought back its beloved breakfast bagel sandwiches nationwide, after limited releases in select U.S. markets.

McDonald's announced this week that bagel sandwiches are now available at locations across the country. That means customers can get a bacon, egg and cheese bagel sandwich or any other variety in all corners of the U.S.