LINE 13x9-inch pan with foil, with ends of foil extending over sides; spray with cooking spray. Microwave 5 oz. chocolate and 1/2 cup butter in medium microwaveable bowl on HIGH 2 min. or until butter is melted; stir until chocolate is completely melted and mixture is well blended. Stir in graham crumbs, nuts and 1 cup coconut; press onto bottom of prepared pan. Refrigerate 15 min.
BEAT cream cheese with mixer until creamy. Gradually add milk, beating well after each addition. Add dry pudding mix; beat 2 min. (Mixture will be stiff.) Stir in 1 cup of the remaining coconut; spread over chocolate layer in pan.
MICROWAVE remaining butter and chocolate in microwaveable bowl 1 min. or until butter is melted; stir until chocolate is completely melted and mixture is well blended. Pour over pudding layer; tilt pan to evenly cover pudding layer. Sprinkle with remaining coconut. Refrigerate 2 hours or until firm. Use foil handles to lift dessert from pan before cutting into bars.