Whisk the egg yolks with sugar until light and fluffy. Over low heat, warm the milk and add all the spices. Once it comes to a boil, slowly pour in the egg yolk mixture while stirring constantly. Cook until thickened, then add the cream, mix well, and heat a little more, the mixture should reach the consistency of kefir.

Remove from heat and pour in the rum. For a kid-friendly version, you can skip this step. Whip the cream (unsweetened) to stiff peaks. Pour the eggnog into glasses, top each one with a spoonful of whipped cream and a little sprinkle of cinnamon.

Drink hot, right away!