Ivar "Pop" Coulson invented the milkshake at a Walgreens soda fountain in Chicago, Il., in 1922. An American classic, his chocolate malted milkshake was an instant success and Americans have been enjoying this liquid dessert with burgers for decades. Like drinking your ice cream instead of eating it with a spoon? Milkshakes are a combinations of ice cream, milk, sweetener, and flavoring. Now serving up the best liquid nitrogen chocolate and vanilla shakes in Las Vegas.