What is the lowest calorie breakfast item at McDonald's?

Online Answer
Egg McMuffinThe breakfast menu item with the lowest amount of calories available at McDonald's is the Egg McMuffin. It is made from a freshly-cracked egg on top of a buttered and toasted English muffin, layered with American cheese, and a slice of Canadian bacon.
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But as the The Kitchn wisely points out, the Egg McMuffin is surprisingly not that horrible for you! The classic breakfast sandwich (which is now available all-day long) consists of an English muffin, one egg, one small circle of Canadian bacon, American cheese, and butter. It comes in at a meager 290 calories.
The Egg McMuffin is made with a real egg that is poached and not fried. Your classic sandwich has a small circle of Canadian bacon, a single slice of American cheese, and real butter.
It is OK to eat a McMuffin everyday. The main constituents are bread, eggs, and some sort of meat. If you cut the butter and the hashbrown out, then it is a completely reasonable breakfast..
A set of eight rings is placed on the grill and real butter is misted over the grill and rings. One Grade A egg is cracked into each of the rings and the yolks are broken to make sure all eight eggs cook at the same pace.
The egg-and-cheese-only McMuffin does what it needs to do for a vegetarian.