Prepare an 8x8 pan by lining it with aluminum foil. Heat butter, eggnog, and sugar over medium heat in a large saucepan, stirring continuously. When mixture begins to simmer (do not boil), add white bark. Continue to stir until all white bark is melted. Remove from heat and stir in marshmallow creme, nutmeg, 1/2 tsp cinnamon, and vanilla until uniform. Pour fudge into prepared 8x8. Sprinkle 1/2 tsp of cinnamon evenly over top. Chill for about 2 hours or until fudge is set. ENJOY!