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Spray an 8-inch square baking pan with cooking spray and line the bottom with parchment paper (or wax paper). Set pan aside.
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Combine the white chocolate chips, Biscoff, cinnamon, and salt in a large microwave-safe bowl.
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Heat in 20-second intervals, stirring well after each interval, until the baking chips and Biscoff are melted and smooth. (Sometimes the chips don’t melt well, just keep stirring!)
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Add the vanilla and stir until combined. Quickly mix in the sweetened condensed milk; the fudge sets up quickly once the condensed milk is added so mix fast.
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Scrape into the prepared baking dish and refrigerate until set, about 2 hours. Slice and serve.