McDonald's started serving breakfast with the introduction of the Egg McMuffin in 1972.
The Egg McMuffin was introduced by McDonald's in 1972 as a breakfast sandwich that could be prepared quickly and easily. It consists of a toasted English muffin, a slice of Canadian bacon, a melted slice of American cheese, and a freshly cracked egg, all served together in a convenient handheld sandwich. The Egg McMuffin was an instant hit and helped to establish McDonald's as a major player in the fast-food breakfast market. Today, McDonald's breakfast menu includes a wide variety of items, including breakfast sandwiches, pancakes, and burritos, and is available at most locations throughout the day.