1Preheat your oven to 160°C (320°F).
Crush the chocolate cookies into fine crumbs and mix them with the melted unsalted butter.
Press the cookie mixture into the bottom of a springform pan to form the crust.
In a mixing bowl, beat the cream cheese and sugar until smooth.
Add the eggs one at a time, mixing well after each addition.
Melt the dark chocolate in a microwave or double boiler.
Pour the cream cheese mixture over the crust in the pan.
Drizzle the melted dark chocolate over the cream cheese mixture and use a knife to swirl it into the batter.
Bake the cheesecake in the preheated oven for 45-50 minutes, or until the center is set.
Allow the cheesecake to cool to room temperature, then refrigerate for at least 4 hours before serving.