Line a 8×8 baking dish with parchment paper.
In a medium saucepan add the butter, eggnog and sugar.
Bring to a boil over medium heat.
Use a candy thermometer, cook until it reaches 225.
Add your white chocolate and stir until melted.
Add in the Marshmallow creme, vanilla and nutmeg until smooth.
Pour into prepared your baking dish.
Set to the side to set for 3 hours.
Remove from dish and cut into 1 inch squares.