Caramel Crunch Bars

Line 8-inch square pan. Grease pan generously with shortening. Place grahams on bottom of pan, cutting to fit if necessary. Microwave caramel bits and milk in microwaveable bowl on high for 2 min. or until caramel bits are completely melted and mixture is well 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.