<Tr> <Td> "</Td> <Td>... a crazy idea--a breakfast sandwich . It consisted of an egg that had been formed in a Teflon circle with the yolk broken, and was dressed with a slice of cheese and a slice of grilled ham . It was served open - faced on a toasted and buttered English muffin . The advent of the Egg McMuffin opened up a whole new area of potential business for McDonald's, the breakfast trade . </Td> <Td>" </Td> </Tr> <P> Peterson had first presented the Egg McMuffin at the Santa Barbara franchise without the knowledge of McDonald's Corporate, which at the time served only lunch and dinner at all their locations . When Corporate discovered the unauthorized breakfast offerings, it initially reprimanded him and threatened him with a number of penalties for breaking the franchise agreement . </P> <P> The first McDonald's Corporate - authorized Egg McMuffin was served at the Belleville, New Jersey McDonald's in 1972 . </P> <P> In the 1970s, some McDonald's restaurants served Egg McMuffins all day as a promotion . </P>

When was the egg mcmuffin added to the menu