Preheat the oven to 350 degrees. Line a couple baking sheets with parchment, set aside.
In the bowl of a stand mixer, combine the butter and brown sugar. Cream until smooth and lighter in color.
Add in the egg and molasses. Mix until combined.
Add in the flour, ginger, cinnamon, cloves, nutmeg, baking soda and salt. Mix until thoroughly combined - stopping the machine and scraping the sides. Mix again.
Using a tablespoon or a small ice cream scoop, scoop out golf-ball sized balls of dough.
Bake in the preheated oven for eight minutes. Immediately upon removing from the oven, use the bottom of a spatula to flatten to about ½ of an inch in thickness.
Allow to cool completely.
While the cookies are cooling, make the frosting: In the bowl of a stand mixer, combine the softened butter and cream cheese. Mix until smooth.
Add in the vanilla (or eggnog!) and about half of the powdered sugar. Mix until combined. Add in the remaining powdered sugar and mix thoroughly. Scrape the sides and mix again.
Transfer the frosting to a piping bag fitted with a large star tip or similar. Once cookies are cool, pipe a small spiral in the center of each cookie. Sprinkle with nutmeg to taste.