Heat the oven to 325°F.

Crush 12 Oreos and stir them into the crust.

Beat the cream cheese and sugar until smooth.

Add the eggs, vanilla, and sour cream, then mix gently.

Fold in 8 chopped Oreos.

Pour the filling into the crust and bake for 50 minutes.

Cool the cheesecake, then chill it for at least 4 hours.

Heat the cream until steaming, then pour it over the chocolate chips and butter.

Stir until smooth and spread the ganache over the cheesecake.

Top with the remaining crushed Oreos.