Marshmallow creme is what makes this easy fudge so incredibly airy (hint: the recipe is inspired by the popular recipe on the back of the label). Chopped toasted walnuts, or any of your favorite nuts, add welcome crunch. Share the rich, delightful squares with all your friends and family.
Toast the walnuts in a medium saute pan over medium heat, tossing frequently, until darkened and fragrant, about 5 minutes. Transfer to a cutting board to cool, then roughly chop.
Line an 8-inch square cake pan with foil, leaving a 2-inch overhang on 2 sides. Coat lightly with cooking spray.
Combine the chocolate and condensed milk in a large saucepan over medium-low heat. Cook, stirring frequently, until the chocolate is melted and the mixture is thick and smooth, 2 to 3 minutes. Remove from the heat. Add the marshmallow creme and butter and stir until completely combined and no streaks remain. Stir in the walnuts until evenly dispersed.
Transfer the mixture to the prepared cake pan. Smooth with a rubber spatula into an even layer. Refrigerate until firm, 2 to 3 hours.
Use the foil overhang to remove the fudge from the pan. Cut into small squares. The fudge can be refrigerated in an airtight container up to 5 days.
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