1 lg. pkg. Oreos
1/2 c. butter
1 lg. container Cool Whip
3 c. milk
1 tsp. vanilla
8 oz. sour cream
1 c. powdered sugar
2 (3 1/2 oz.) boxes instant vanilla pudding

Crush cookies and put half of them in a 9 x 13 inch pan. Mix sour cream and butter until smooth. Mix in powdered sugar. Fold in Cool Whip. In separate bowl, mix pudding, milk and vanilla. Fold the 2 mixtures together and pour over crumbs. Spread remaining crumbs on top. Chill.