Preparations: Line a 3 baking sheets with parchment paper. Preheat the oven to 190C/374F.
In a mixing bowl, mix brown sugar, butter, and granulated sugar until combined then mix in the egg.
Add the eggnog to the mixture, whisk. Then, stir in the flour, ground cinnamon, baking powder, and nutmeg.
Now, wet your hands with some water and scoop up a tablespoon of the batter. Roll it between your wet hands then put onto the baking sheet. Repeat until all the batter finishes.
Bake for about 15 minutes then let the cookies cool down completely.
Making the Topping
Microwave the white chocolate for 30-40 seconds then put it in a piping bag and drizzle the cookies then sprinkle some ground cinnamon on the top.