1. Crush Oreos into bite size pieces. Reserve 1 cup for top. Melt butter and mix with rest of cookies. Press into 9x13 pan. Put in freezer for 5 minutes.
  2. Blend 1/2 of the Cool Whip, the cream cheese and confectioners' sugar. Spread in pan and place in freezer.
  3. Make the pudding according to package and spread on cake. Spread the remaining whipped topping on top of the pudding then sprinkle with the remaining cookies.