Place the egg yolks and white sugar into the blender. Blend for about 2 minutes or until the mix thickens up. Pour the yolk-sugar mix into a large bowl, whisk in milk and cream. Continue mixing until the sugar has completely dissolved. Sprinkle in the nutmeg and pour in the vanilla, mix until well incorporated. Taste and adjust nutmeg if desired.

Chill until ready to serve. Sprinkle ground cinnamon over each cup before serving.

For alcoholic version add a cup of good quality brandy or rum after nutmeg and vanilla has been added. Whisk again until brandy/rum is well incorporated into the eggnog.