The Fast Foodist: McDonald’s is serving 63-cent Egg McMuffins — a look at how the 50-year-old sandwich revolutionized fast food

Let us now praise a famous breakfast sandwich.

I’m talking about the McDonald’s MCD Egg McMuffin, the simple yet simply delicious combo of a fried egg, cheese and Canadian bacon, served on an English muffin. The breakfast offering is turning 50 years old, and McDonald’s is marking the occasion by rolling back the price of a McMuffin to 63 cents on Thursday, provided you order it on the McDonald’s app.

But…