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LINE 8-inch square pan with foil, with ends of foil extending over sides; spray foil with cooking spray. Place grahams on bottom of pan, cutting to fit if necessary.
MICROWAVE caramel bits and milk in microwaveable bowl on HIGH 2 min. or until caramel bits are completely melted and mixture is blended, stirring every 30 sec. Pour over grahams; top with next 3 ingredients. Drizzle with chocolate.
REFRIGERATE at least 1 hour. Use foil handles to remove dessert from pan before cutting into bars to serve.