DENVER--(BUSINESS WIRE)--St. Patrick’s Day is right around the corner and Smashburger, the better burger restaurant known for its smashed-to-order burgers, is smashing the celebration by bringing back a Limited Edition Mint Oreo® Shake, every Leprechaun’s favorite! Made with premium Vanilla Häagen-Dazs® ice cream, crushed Oreo® cookies, and Mint Syrup, this hand-spun shake is guaranteed to make all shake-less friends green with envy. As the luck of the Irish would have it, Smashburger is offeri