In a small saucepan, bring the milk just to a boil over medium-high heat. Put the coffee, chocolate, and whiskey in a blender and pour in the hot milk. Let sit for 10 to 15 seconds so the chocolate begins to melt. Cover securely, place a folded towel over the blender lid, and blend until completely mixed and frothy, about 30 seconds. (Alternatively, you can use a steamer to froth the milk. Add the chocolate, coffee, and whiskey, stir until melted and well blended, and then steam the mixture again for a few seconds more).
Divide the hot chocolate between two mugs, and garnish each with a dollop of whipped cream.
Photo: Scott Phillips