01 -
Assemble all ingredients and ensure you have a large microwave-safe mixing bowl, silicone spatula, and a baking pan lined with parchment or nonstick coating.
02 -
Place sweetened condensed milk, granulated sugar, and softened butter in the bowl. Add cocoa powder and stir thoroughly until smooth and fully blended with no visible lumps.
03 -
Microwave the mixture on high power for 2 minutes, then carefully remove the bowl using oven mitts as it will be hot.
04 -
Stir the mixture vigorously, scraping the sides and bottom to ensure even texture. Return to microwave for an additional 2 minutes on high power.
05 -
Fold in chopped mixed nuts if using, stirring until evenly distributed throughout the chocolate mixture.
06 -
Transfer mixture into the prepared baking pan, smoothing the surface with a spatula. Refrigerate for 1 hour or until fully set.
07 -
Remove set fudge from pan, slice into squares, and serve as desired.