Take a cocktail glass, rim the glass with eggnog, then rim the glass with a cinnamon sugar mixture. Set glass aside.
Fill a cocktail shaker with ice, add 1 oz of vanilla vodka, 1 oz of Disaronno liqueur. Shake store bought eggnog and then add 4 oz of eggnog to cocktail shaker. Add 1/4 tsp of nutmeg or freshly grated nutmeg to bring out the flavors of the cocktail. Shake with ice for 20 seconds.
Serve strained in cinnamon sugar rimmed cocktail glass, such as a martini glass, coupe glass or over ice in a rocks glass. Enjoy!