In a small bowl, combine the ¼ teaspoon nutmeg and ¼ teaspoon cinnamon. Reserve ¼ teaspoon for the topping and set aside.
Prepare a 9-inch square baking dish by lining with parchment paper. Set aside.
In a large saucepan, melt the ¾ cup unsalted butter with 2 cups sugar1/2 cup eggnog, and Pinch fine sea salt over medium high heat. Bring to a boil. Stirring continuously until the mixture reaches a rolling boil for four minutes. (Soft ball stage- 237 to 239 °F).
Remove the mixture from heat. Using an electric mixer and mix with the 7 ounces marshmallow cream, melted 11 ounces white chocolate morsels and 1/4 teaspoon of the spice mixture on medium speed until smooth and white chocolate is completely melted. Pour into the prepared baking dish.
Sprinkle the remaining ¼ teaspoon of the spices over the fudge.
Place the fudge on an even surface for about 4 hours to set.
Use a warm, clean knife to slice the fudge for serving.
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Notes
How to Store Eggnog Fudge
You can leave your fudge out at room temperature or in the fridge in an airtight container. However, fudge does not need to be stored in the refrigerator, in fact, cold air can actually dry the fudge out. Keep in an airtight container for up to 14 days.
How to Freeze Eggnog Fudge
The best thing about this recipe is it can be made in advance and keeps very well!This eggnog fudge recipe can also be frozen to enjoy long after after the holiday party! When freezing homemade fudge, I like to double wrap it in freezer safe packaging to prevent freezer burn. I prefer to freeze fudge in a large block, rather than pre-cutting it. I feel this protects the inside better and ensures the freshest taste possible. Be sure to enjoy the fudge within two months. To thaw, bring it out to room temperature about 24 hours before you want to enjoy it. Store in an airtight container for freshness.