
Line a 9x13 inch pan with aluminum foil and lightly sprinkle with cooking spray. Set aside.
In a large pot over medium heat combine eggnog and sugar. Bring to a boil stirring occasionally. Once it comes to a boil, stir constantly for 10 minutes.
Remove from the heat and add white chocolate chips, marshmallow cream, and butter. Stir until completely melted and incorporated.
Pour into your foil-lined 9x13 pan and spread evenly until smooth. Sprinkle the top with nutmeg. Let completely cool to room temperature and store in the refrigerator in an airtight container.