You can mix the drink in a cocktail shaker, if you don’t mind missing out on the layered effect.
The smaller cup on a bartender’s measuring device is usually ¾ oz. (a half jigger / half shot), but not always. [3] X Research source If you don’t have one of these, use 1½ tablespoons instead. ½ oz is equivalent to 1 tablespoon. You can also add the coffee liqueur by eye.
The milk will sink past the cola, but if poured slowly you can still form a distinct layer. [4] X Research source
