In a medium-sized bowl, whisk together the eggs and sugar until light and fluffy.
In a medium saucepan, combine the cream and milk and heat over low heat until warm.
Slowly pour the warm cream mixture into the egg mixture, whisking constantly.
Return the mixture to the saucepan and cook over low heat, stirring constantly, until the mixture thickens and coats the back of a spoon (about 5 minutes).
Remove the mixture from the heat and stir in the nutmeg, cinnamon, and vanilla extract.
Pour the eggnog into a pitcher or serving bowl and chill in the refrigerator for at least 3 hours before serving.
Interesting Facts
Eggnog has been around since the 1700s.
It was originally served as a hot beverage.
It's a popular holiday drink in the United States, Canada and the United Kingdom.