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Spray an 8-inch square baking pan with cooking spray and line the bottom with parchment paper (or wax paper or aluminum foil). Set pan aside.
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Combine the chocolate chips, sweetened condensed milk, salt, and half of the chopped candy bars in a large microwave-safe bowl.
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Heat in 30-second intervals, stirring well after each interval, until the chocolate is melted and the mixture is smooth. (Sometimes the candy bars don’t melt well, just keep stirring—it’s fine if you have a few bits of unmelted candy; you just don’t want huge chunks.)
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Fold in the remaining candy bars, then scrape into the prepared baking dish and smooth into an even layer.
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Refrigerate until set, about 2 hours. Once set, slice your fudge and serve.