01 -
Assemble all ingredients and prepare a large microwave-safe mixing bowl. Line an 8x8-inch baking pan with parchment paper or use a silicone mold for easy removal.
02 -
In the microwave-safe bowl, combine sweetened condensed milk, granulated sugar, and softened unsalted butter. Mix to blend. Add cocoa powder and stir thoroughly until the mixture is completely smooth and homogeneous.
03 -
Microwave the mixture on high power for 2 minutes. Carefully remove the bowl from the microwave using oven mitts, as it will be hot.
04 -
Stir the mixture vigorously to ensure even consistency. Return the bowl to the microwave and heat on high power for an additional 2 minutes.
05 -
Fold in chopped nuts, if using, stirring until evenly distributed throughout the fudge mixture.
06 -
Pour the hot fudge mixture into the prepared pan, smoothing the surface with a spatula. Refrigerate uncovered for at least 1 hour, allowing the fudge to cool and set completely.
07 -
Once completely chilled, remove the fudge from the pan and cut into squares. Serve and enjoy.