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Place the chocolate chips in a small heat-proof bowl and microwave in 30-second intervals, stirring after each interval, until chocolate is melted and smooth. Set aside to cool while you continue.**
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Combine the cream cheese and sugar in a large mixing bowl and beat with an electric mixer on high speed for 5 minutes, stopping the mixer to scrape down the sides and bottom of the bowl as necessary.
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Add the eggs, vanilla, and salt and beat to combine. Scrape down the sides and bottom of the bowl.
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Beat in the chocolate until well combined. Scrape down the sides and bottom of the bowl again, then beat 30 seconds more. Fold in the chopped Toblerone.
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Pour the filling into the chilled crust. Bake 35 to 40 minutes, until the edges of the cheesecake are puffed but the center still jiggles a bit with you tap the pan.
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Cool cheesecake to room temperature on a wire rack, then cover loosely with plastic wrap and refrigerate for at least 8 hours. (Or up to a couple of days.)