1. 1. Preheat your oven to 350°F. Line baking sheets with parchment paper.

2. 2. In a large bowl, cream together the butter and brown sugar until light and fluffy. Beat in the egg yolks, eggnog, and spiced rum or rum extract.

3. 3. In a separate bowl, whisk together the flour, baking powder, salt, nutmeg, cinnamon, and allspice. Gradually mix the dry ingredients into the wet ingredients until the dough is well combined.

4. 4. Lightly flour your counter and rolling pin. Roll the dough to a 1/4-inch thickness. Cut the dough into desired shapes using cookie cutters.

5. 5. Place the shaped cookies on the prepared baking sheets and bake for 8–10 minutes, or until the edges are lightly golden. Allow the cookies to cool completely on wire racks.

6. 6. In a medium bowl, beat the butter until creamy.

7. 7. Gradually add the confectioner’s sugar, then mix in the spiced rum (or extract), eggnog, nutmeg, and cinnamon until the frosting is smooth and creamy.

8. 8. Once the cookies are completely cooled, frost them with the eggnog frosting.

9. 9. Sprinkle the frosted cookies with holiday sprinkles to add a festive touch.

10. 10. Allow the frosting to set before serving the Eggnog Cookies with Eggnog Frosting.