Preheat the oven and prepare the baking dish.

In a bowl, combine crushed Oreo cookies and melted butter. Press into the bottom of the dish.

Melt the bittersweet chocolate in a double boiler or microwave.

In a mixing bowl, beat the cream cheese, granulated sugar, and light brown sugar until smooth.

Add cocoa powder, eggs, egg yolks, heavy cream, and vanilla extract to the cream cheese mixture. Mix until well combined.

Fold in melted bittersweet chocolate and semi-sweet chocolate.

Pour the chocolate cheesecake filling over the crust in the baking dish.

Bake in the oven until set.

Allow to cool, then refrigerate until fully chilled before slicing into bars.