Crush the entire package of Oreos using a food processor until finely ground, reserving 1 cup of the crumbs for garnishing the final dessert.

In a mixing bowl, combine the remaining crushed Oreos with melted butter and stir until evenly moistened. Press this mixture firmly into the base of a 9 x 13 inch baking dish to form the crust.

In a separate large bowl, beat the softened cream cheese, powdered sugar, and half of the Cool Whip with an electric mixer until smooth and fluffy.

Evenly spread this cream cheese mixture over the prepared Oreo crust, then place the dish in the refrigerator to chill while preparing the pudding layer.

In another bowl, whisk together the chocolate instant pudding mix and cold milk for several minutes until it thickens. Once set, gently spread the pudding over the cream cheese layer. Let it rest for about 10 minutes to allow the pudding to firm.

Top the dessert with the remaining Cool Whip, spreading it out smoothly over the pudding. Finish by sprinkling the reserved Oreo crumbs on top.