Add Oreos to a food processor and chop them up finely. (Reserve 1/2 cup of crushed Oreos for the top layer.) Add remaining chopped Oreos to a medium bowl, then combine them with the melted butter. Mix until well incorporated and transfer to a 9″x13″ baking dish. Spread them out evenly and press the crust layer firmly down with the spatula. Chill for 20 minutes in the refrigerator.

In a large bowl, combine cream cheese, powdered sugar, vanilla extract, and 8 ounces of whipped topping. Mix with a hand mixer until smooth and creamy. Evenly spread out over the Oreo crust layer, then chill in the refrigerator for 20 minutes.

In a large bowl, add cold milk, vanilla pudding, and chocolate pudding. Mix with an electric hand mixer on a slow setting, mix until the pudding is well blended and thickened. About 2 minutes. Evenly spread out over the cheesecake layer, then chill in the refrigerator for 20 minutes or until the pudding has completely set up.

Spread the whipped topping over the pudding layer evenly. Top with reserved chopped Oreos and drizzle chocolate sauce over the top. Chill in the refrigerator for a minimum of one hour before serving.