Add 30 chocolate sandwich cookies to a food processor and pulse until you have fine crumbs. Transfer them to a medium bowl and set aside.
Pour the melted butter over the cookie crumbs and stir until everything is well combined.
Press the cookie mixture firmly into the bottom of a 9x13 pan to form the crust.
In another medium bowl, beat together the cream cheese and powdered sugar until smooth. Gently fold in 8 oz of whipped topping, then spread the mixture evenly over the crust, covering it completely.
In a separate bowl, whisk the instant pudding with the milk until smooth and thickened. Spread the pudding evenly over the cream cheese layer.
Top with the remaining 8 oz of whipped topping, spreading it out to cover the pudding completely.
Crush the eight cookies you set aside earlier and sprinkle the crumbs over the top. Cover the pan and refrigerate for at least 2 hours.
Slice it, serve, and enjoy chilled!