Preheat oven to 350 degrees. Line cookies sheets with parchment paper.
Combine the flour, salt, baking powder, cinnamon, nutmeg, ginger and cloves together in a small bowl.
Using an electric mixer cream the sugar and butter together in a large bowl.
Add the eggnog, vanilla, and egg beating at medium speed until smooth.
Gradually add the dry ingredients to the wet ingredients. Beat at low speed just until blended.
Create 2 tablespoon sized balls of cookie dough. Gently roll into a ball, then roll each ball in the additional sugar to coat. Place the balls on the prepared baking sheet and slightly press down.
Leave 1 inch between each cookie.
Sprinkle lightly with additional nutmeg.
Bake at 350 degrees for about 10-12 minutes. (Or until bottoms turn light brown.)
Allow the cookies to cool slightly before transferring to a wire rack.
Leave the cookies on a wire rack to cool completely.
When cookies are cool, frost them with the buttercream frosting if desired and sprinkle a little cinnamon on top of the frosting.
Serve and enjoy!