Oreo Cookie Dessert

1 (15oz.) pkg. Oreo Cookies, crushed
1/2 c. melted butter
1 (8oz) cream cheese
1 (16oz) cool whip
1 c. powdered sugar
1 lg. box instant chocolate pudding
2 c. milk

Set aside 1/2 c. cookie crumbs. Mix remaining crumbs with butter. Press into 9x13" pan. Refrigerate 1 hour. Mix cream cheese, powdered sugar, and half the cool whip. Spread over cookie layer and refrigerate 1 hour. Mix pudding per package directions and spread on top of cheese layer. Set about 15 minutes. Top with cool whip. Sprinkle with remaining cookie crumbs.