2 cups cold milk | 2 pkg. (4-serving size each) JELL-O Chocolate Flavor Instant Pudding & Pie Filling | 1 tub (8 oz.) COOL WHIP Whipped Topping, thawed, divided | 2 milk chocolate English toffee candy bars (1.4 oz. each), chopped, divided | 1 OREO Pie Crust (6 oz.) | 1 square BAKER'S Semi-Sweet Baking Chocolate, melted | | |