PREHEAT oven to 350°F Prepare and bake cake mix in two (9-inch) round cake pans as directed on package. Cool in pans 5 minute Invert onto wire racks; remove pans. Cool layers completely.
PLACE chocolate and butter in small microwaveable bowl. Microwave on HIGH 2 minute or until butter is melted. Stir until chocolate is completely melted. Cool 5 minute.
BEAT cream cheese and sugar in large bowl with electric mixer on medium speed until well blended. Add the whipped topping and cookie crumbs; mix lightly. Place 1 of the cake layers, top-side down, on serving plate; spread with the cream cheese mixture. Cover with the remaining cake layer, top-side up. Spoon glaze over top of cake. Let stand until set. Store in refrigerator.