Melt the Chocolate: In a medium-sized saucepan, combine the semisweet chocolate chips, sweetened condensed milk, and butter over low heat. Stir continuously until the chocolate is fully melted and smooth.
Add Flavor: Remove the pan from heat and stir in the vanilla extract and a pinch of salt. Mix well to incorporate all of the flavors.
Pour and Set: Line an 8x8 inch baking dish with parchment paper. Pour the melted chocolate mixture into the dish and spread it evenly. You can add any toppings at this stage, like nuts or a sprinkle of sea salt.
Cool: Refrigerate the fudge for at least 2 hours until set. Once firm, lift it out of the dish using the parchment paper and cut into squares.
Enjoy: Treat yourself to these delicious squares and share them with family and friends!