Make the Cheesecake:

Preheat oven to 325°F (165°C).
Beat cream cheese until smooth. Add sugar and eggs; beat until combined.
Fold in chopped Oreos.
Pour into a greased 9-inch springform pan.
Bake for 45-55 minutes. Cool, then freeze

Make the Ganache:

Heat cream until just boiling, pour over chocolate chips.
Let sit for 5 minutes, then stir until smooth.

Assemble the Cake:

Place one layer of chocolate cake on a serving plate.
Top with the frozen cheesecake layer.
Add the second chocolate cake layer.
Pour ganache over the top, allowing it to drip down the sides.
Top with whipped topping and halved Oreo cookies.