16 oz. pkg. Oreo cookies

1 stick butter

3 (8 oz.) pkgs. Cream cheese

¾ cup powdered sugar

16 oz. cool whip

2 (6 oz.) pkgs. Instant chocolate pudding

3 cups milk

Crush cookies and mix with butter (reserve 1/3 cup).  Press into a 9×13-inch pan.  Beat cream cheese with powdered sugar until smooth.  Add ¾ of the cool whip and beat until smooth.  Pour over the crust.  Whisk chocolate pudding and milk.  Pour over cream mixture.  Sprinkle with Oreo crumbs.  Garnish with cool whip in a pastry tube.