Line a 8x8 pan with foil, then butter foil.
Combine butter, eggnog and sugar in a pan and bring to a boil over medium heat.
Cook until temperature reaches 234.
Remove from heat and stir in white chocolate until completely melted and incorporated.
Stir in Marshmallow creme, vanilla and nutmeg until smooth.
Spread into prepared pan.
Dust top with a little more nutmeg.
Allow to cool before removing from pan and cutting.