Eggnog Magic Cake

prepared Eggnog (, lukewarm)

unsalted butter (, melted and cooled (cannot be hot) (plus some unmelted butter for preparing the pan))

Confectioners’ Sugar ((plus some for dusting the top of the finished cake))

Eggs (, room temperature and separated)

White Distilled Vinegar

gluten-free flour ((I used King Arthur’s Gluten-Free flour blend); if making a gluten version, all purpose flour may be substituted)

Dark Rum ((can be substituted for more eggnog if preferable))

Vanilla Extract

Whole nutmeg to grate on top or ground nutmeg to sprinkle