The Egg McMuffin was McDonald’s first nationally recognized breakfast sandwich, introduced in 1972.
Herb Peterson created the sandwich in Southern California, combining a cooked egg, Canadian bacon, and cheese with an English muffin. The format gave McDonald’s a portable breakfast item that fit the chain’s quick-service model.
The sandwich’s branding was important because it used the “Mc” naming pattern while clearly signaling its main ingredient. Its success helped establish breakfast as a major part of McDonald’s identity rather than a limited local offering. Later breakfast products expanded the menu with biscuits, hotcakes, sausage, and other items.
The Egg McMuffin is sometimes confused with later breakfast sandwiches such as the Sausage McGriddle. The McGriddle was introduced decades afterward and uses griddle cakes rather than an English muffin. The 1972 Egg McMuffin remains the landmark product associated with McDonald’s breakfast expansion.