Making Eggnog Fudge is straightforward if you follow these simple steps:

1. Prepare Your Pan: Line an 8-inch square baking dish with parchment paper, leaving some overhang for easy removal later. This will help you lift the fudge out once it’s set.
2. Combine Ingredients: In a medium saucepan, combine the granulated sugar, unsalted butter, and eggnog. Stir the mixture over medium heat until it comes to a boil.
3. Boil Mixture: Allow the mixture to boil for about 5 minutes, stirring constantly. This will help dissolve the sugar and create a smooth base.
4. Add Flavorings: Remove the saucepan from heat and stir in the vanilla extract, ground nutmeg, and ground cinnamon, mixing well.
5. Incorporate Chocolate: Immediately add the white chocolate chips and marshmallow cream to the saucepan. Stir until everything is melted and combined into a smooth mixture.
6. Optional Nuts: If desired, fold in the chopped pecans or walnuts for added texture and flavor.
7. Spread in Pan: Pour the fudge mixture into the prepared baking dish, spreading it evenly with a spatula.
8. Cool the Fudge: Allow the fudge to cool at room temperature for about 2 hours, or until it is set.
9. Cut into Squares: Once set, lift the fudge from the pan using the parchment overhang. Place it on a cutting board and cut it into squares.
10. Serve and Enjoy: Enjoy your Eggnog Fudge as a festive treat during the holidays!