The Egg McMuffin became McDonald’s first widely recognized breakfast sandwich after its introduction in 1972.
Herb Peterson, a McDonald’s franchisee in Santa Barbara, California, developed the sandwich with the restaurant’s breakfast expansion in mind. It used an English muffin, a freshly cooked egg, Canadian bacon, and cheese, creating a portable product that fit McDonald’s existing fast-service format.
The Egg McMuffin helped establish breakfast as an important part of McDonald’s brand identity. Before breakfast became a standard daypart for the chain, McDonald’s was primarily associated with lunch, dinner, burgers, fries, and milkshakes.
People sometimes date the national breakfast launch to 1972, but the sandwich was tested and introduced locally before being rolled out more broadly. Other breakfast products followed, yet the Egg McMuffin remained the signature item that most clearly represented McDonald’s shift into morning dining.