01 -
Line a square baking dish with aluminum foil and coat the foil with unsalted butter or nonstick spray.
02 -
Combine unsalted butter, granulated sugar, and eggnog in a large saucepan. Warm over medium-high heat, stirring frequently, until the mixture registers 234°F on a candy thermometer.
03 -
Remove saucepan from heat. Immediately stir in white chocolate chips, mixing until fully melted and the mixture is smooth.
04 -
Fold in marshmallow creme, vanilla extract, and ground nutmeg. Stir until the mixture is completely blended and homogeneous.
05 -
Evenly spread the mixture into the prepared baking dish using a spatula. Sprinkle additional ground nutmeg over the surface if desired.
06 -
Allow the fudge to set at room temperature until fully firm. Use the foil to lift the set fudge from the pan, then cut into squares for serving.