Brew coffee or espresso.
Heat eggnog and combine with milk.
Use frothing wand slowly up and down, side to side until eggnog and milk is thick and foamed. (Or put in blender if you don't have a frothing wand).
Pour coffee or espresso into mug, sweeten to taste and pour hot eggnog mixture over the top.
Sprinkle with nutmeg and enjoy!