Brown your salted butter before mixing into the dough to add a rich, nutty complexity that elevates the eggnog flavor profile and creates a more sophisticated cookie texture.

Refrigerate the cookie dough for at least 2 hours before baking to prevent spreading and ensure crisp edges with a tender, melt-in-your-mouth center that showcases the buttery crumb.

Infuse your rum extract and vanilla extract with ground nutmeg for 15 minutes before adding to the dough to intensify the spice notes and create a more cohesive eggnog flavor throughout.

Whip the powdered sugar glaze with cold whipping cream gradually, adjusting consistency as you go—thicker for piping, thinner for coating—to achieve the perfect creamy finish without deflating the whipped texture.

Bake until edges are just barely golden but centers still appear slightly underdone—they'll continue cooking as they cool, resulting in that signature melt-in-your-mouth quality without becoming dry or hard.