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Line a small square pan with parchment paper, leaving extra paper hanging over the sides.
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In a saucepan over low heat, add the chocolate chips, sweetened condensed milk, and butter. Stir continuously until everything melts and becomes smooth.
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Remove the pan from heat and stir in the vanilla extract and salt until fully mixed.
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Pour the mixture into the prepared pan and spread it evenly with a spatula.
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Refrigerate for at least 2 hours, until the fudge is firm and set.
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Lift the fudge out using the parchment paper and cut into small squares before serving.