The Shamrock Shake is a milkshake made with vanilla soft-serve ice cream, artificially flavored minty green syrup and whipped topping. McDonald's debuted the first Shamrock Shake in 1970, and the cult classic has been returning to the menu around St. Patrick's Day each year since.

It's soon to be Shamrock Shake season. McDonald's Shamrock Shake, a milkshake made with vanilla soft-serve ice cream, artificially-flavored minty green syrup and whipped topping, will return to restaurants on Monday,

The McFlurry blends vanilla soft serve with Shamrock Shake syrup and Oreo pieces in the limited-time treat. The sippable version omits the cookie crumble but has the same vanilla