Even the famously affordable McDonald's menu has been subject to inflation over the years. Now—for one day only—customers will get to purchase a classic item for its original price. As KAKE reports, McDonald's is selling its Egg McMuffin for $.63 in honor of the sandwich's 50th anniversary on Thursday, November 18, 2021.

The Egg McMuffin—a fast food take on eggs Benedict with cheese instead of hollandaise sauce—debuted at a McDonald's restaurant in Santa Barbara, California, in 1971. Franchise owner Herb Peterson invented the McMuffin with dreams of making the burger chain competitive in the breakfast market. Four years later, the sandwich was a staple of McDonald's menus nationwide.

The McMuffin has gone through several changes since its conception. McDonald's now offers sausage McMuffins in addition to the classic Canadian bacon, and it no longer sells the item for under a dollar. Some of the most innovative twists on the sandwich have come from customers. As part of the McMuffin's anniversary, the company is advertising some of the most popular "fan hacks" diners can order off the secret menu. Options include an Egg McMuffin with bacon and tomato, a McMuffin with syrup and a chicken patty, and a McMuffin served between two hashbrowns instead of English muffins.

No matter how you take your Egg McMuffin, November 18 is the day to order one. The special price of $.63 will be in effect during breakfast hours (6 a.m. to 10:30 a.m.) on Thursday. Just make sure you order through the McDonald's app to take advantage of the promotion.

[h/t KAKE]