01 - Combine almond milk and heavy cream in a medium saucepan over medium heat. Warm gently until steaming, but do not let the mixture come to a boil.
02 - Whisk eggs and powdered erythritol in a mixing bowl until the mixture becomes pale in color and smooth in texture.
03 - Gradually ladle small amounts of the warm milk mixture into the eggs while whisking continuously. This prevents the eggs from curdling and ensures a smooth, creamy consistency.
04 - Pour the tempered mixture back into the saucepan. Cook over low heat, stirring constantly with a heat-proof spatula or whisk, until the mixture thickens slightly and coats the back of a spoon, approximately 5 to 8 minutes.
05 - Remove from heat and stir in ground nutmeg, cinnamon, and vanilla extract. If adding alcohol, incorporate it at this stage.
06 - Transfer the eggnog to a bowl or pitcher. Refrigerate for at least 1 hour to allow flavors to meld and the mixture to chill completely.
07 - Pour chilled eggnog into serving glasses. Top with fresh whipped cream and dust with additional ground nutmeg or cinnamon.