1 1/3 cups butter, softened
1 cup brown sugar, packed
4 egg yolks 
2 Tbsp. eggnog 
1/2 tsp. rum extract 
3 cups all purpose flour
Eggnog Frosting:
4 1/2 cups confectioners sugar
3/4 cup butter, softened
1 1/2 tsp. rum extract 
1/2 tsp. ground nutmeg 
1/4 tsp. ground cinnamon 
2 to 3 Tbsp. eggnog 
Ground nutmeg