LINE 9-inch square pan with foil, with ends of foil extending over sides. Mix cookie crumbs and butter; press onto bottom of pan.
BEAT cream cheese, sugar and vanilla in large bowl with mixer until light and fluffy. Add 2 cups Cool Whip; beat on low speed until blended. Spread over crust. Freeze 4 hours or until firm.
MICROWAVE remaining Cool Whip and chocolate in microwavable bowl on high 1 min.; stir until chocolate is completely melted and mixture is well blended. Cool slightly. Use foil handles to lift cheesecake from pan. Drizzle with chocolate mixture.
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