Even if you’re not the biggest fan of eggnog served straight, we’re willing to bet you might just love it in this dreamy holiday spin on a creamsicle.
Combine sugar and cinnamon on a small plate. Run orange wedge around rim of a rocks glass; dip rim in sugar-cinnamon mixture to coat.
Fill glass with ice; stir in eggnog and Grand Marnier. Garnish with squeeze of orange wedge, if desired.