Preheat oven to 300 degrees. Line cookies sheets with parchment paper.Combine the flour, baking powder, cinnamon, nutmeg 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 yolks beating at medium speed until smooth.Gradually add the dry ingredients to the wet ingredients. Beat at low speed just until blended.Using a small ice cream scoop measure the dough out and drop them by teaspoons onto the prepared cookie sheets. Leave 1 inch between each cookie.Sprinkle lightly with additional nutmeg.Bake at 350 degrees for 23-25 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.
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