Mix together butter and sugar
Add in eggnog and egg
Add flour, baking powder, baking soda, salt and nutmeg
Chill for atleast one hour
Drop by teaspoonfuls (I rolled mine for a second) onto greased baking sheet
Bake at 350 degrees for 8-10 minutes
When you pull them out out the oven, push down on the top of the cookie with the bottom of a greased flat bottom glass to flatten into a cookies shape (do NOT skip this part!)
Cool on drying rack for minimum of one hour
Frost with eggnog frosting and sprinkle with nutmeg (the karo syrup makes the frosting harden when dry)
You absolutely have to flatten the cookies with the bottom of a cup right when they come out of the oven when they are still warm.
The cookies will have to sit for atleast an hour for the frosting to dry completely before being stacked.