01 -
Line an 20-centimetre square baking pan with parchment paper, ensuring the edges overhang for easy removal.
02 -
In a medium saucepan over low heat, combine chocolate chips and sweetened condensed milk. Stir constantly until chocolate is fully melted and the mixture is smooth and glossy.
03 -
Remove the saucepan from the heat. Stir in vanilla extract and, if using, fold in chopped nuts until evenly distributed.
04 -
Pour the mixture into the prepared pan and spread it evenly with a spatula, smoothing the surface.
05 -
Refrigerate the pan uncovered for at least 2 hours, or until the fudge is completely set and firm to the touch.
06 -
Lift the set fudge out of the pan using the parchment paper. Cut into even squares with a sharp knife and serve chilled or at room temperature.