Pour the egg nog into a small saucepan and sprinkle the gelatin on top.
Let the gelatin bloom for about 5 minutes or until there are no dry crystals on top.
Over medium-high heat, whisk until the gelatin dissolves and the liquid has barely come to a simmer.
Pour ½ cup servings into individual glasses, jars, or cups.
Chill for at least 2 hours, but preferably overnight.
Garnish with a little nutmeg at serving (optional.)
Notes
You can also chill this in one big bowl and scoop out servings, however it will definitely need to chill overnight. Eggnog - use full-fat or any of the non-dairy options available!