What was McDonald’s first menu item sold nationwide as a breakfast product?

The Egg McMuffin was McDonald’s first breakfast product sold nationwide.

Herb Peterson created the Egg McMuffin in the early 1970s while operating a McDonald’s franchise in Santa Barbara, California. The sandwich used a toasted English muffin, a round egg, Canadian bacon, and cheese. Its compact format made it suitable for quick service and helped establish breakfast as a major part of McDonald’s identity.

McDonald’s tested the sandwich in select markets before rolling it out nationwide in 1975. The product expanded the meaning of the McDonald’s visit beyond lunch and dinner, giving the brand a strong morning occasion.

The Egg McMuffin is sometimes confused with later breakfast products such as the Sausage McMuffin or Big Breakfast. Those items became important menu offerings, but the Egg McMuffin was the pioneering national breakfast sandwich.