Add chocolate sandwich cookies and hazelnuts to a food processor and pulse until finely ground
Pour melted butter into the mixture and pulse again, then press into a prepared springform pan and bake
Whip together cream cheese and Greek yogurt in an electric mixer, then mix in sugar, salt, and cocoa powder
Beat in eggs one at a time, then mix in melted chocolate
Pour the filling over the baked, cooled crust, then bake the cheesecake using a water bath
Melt together heavy cream, Nutella, and chopped dark chocolate, then pour over the cooled cheesecake
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