For filling, beat cream cheese and sugar in large bowl with electric mixer on medium speed until well blended. Gently stir in whipped topping and crushed cookies. Place 1 of the cake layers on serving plate, top side up. Spread filling onto cake and top with remaining cake.
For glaze, melt chocolate in small microwaveable bowl on high 1-2 minutes or until chocolate is melted, stirring after 30 seconds. Blend in butter. Set aside to slightly thicken, about 5 minutes. Spoon glaze to cover top of cake only.