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In a medium saucepan, melt the chocolate chips and sweetened condensed milk over medium heat, stirring constantly until the mixture is homogeneous and lump-free.
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Turn off the heat.
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Add the vanilla and salt and stir until they, too, are fully incorporated.
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Pour the mixture into an 8" by 8" baking pan lined with waxed paper and smooth the mixture so it is evenly distributed across the pan.
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Cover the pan with aluminum foil and refrigerate the fudge for two to three hours, or until firm.
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Using a sharp, serrated knife, slice the fudge into 49 pieces, then pull it from the wazed paper.
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Enjoy! (Store the extras in an airtight container.).