PREHEAT oven to 350°F. Prepare and bake cake mix as directed on package in two 9-inch round baking pans. Cool 5 min.; remove from pans. Cool completely on wire racks.
MICROWAVE chocolate and butter in small microwaveable bowl on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted. Cool 5 min.
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 one cake layer, top-side down, on serving plate. Spread top of layer evenly with cream cheese mixture. Cover with remaining cake layer, top-side up. Spoon chocolate glaze over top of cake. Let stand until set. Store in refrigerator