1. Crush the chocolate sandwich cookies into fine crumbs using a food processor.

2. Combine the crumbs with melted butter until the texture resembles wet sand.

3. Press the mixture firmly into the bottom and slightly up the sides of a springform pan, then refrigerate.

4. Melt the chopped dark chocolate using a double boiler or microwave, then let it cool slightly.

5. Beat the softened cream cheese and sugar together until light and smooth.

6. Mix in the vanilla extract, followed by the cooled melted chocolate until evenly combined.

7. Whip the cold heavy cream to stiff peaks in a separate bowl.

8. Gently fold the whipped cream into the chocolate mixture, keeping it airy.

9. Spread the filling into the prepared crust and smooth the top.

10. Cover and refrigerate for at least 6 hours or overnight until fully set.

11. Remove from pan, slice, and serve with toppings if desired.