A serving of this sweet treat goes a long way on chocolate flavor.
Substitute 3 pkg. (4 oz. each) BAKER'S Semi-Sweet Chocolate, chopped, for the chocolate chunks.
Line 15x10x1-inch pan with foil, with ends of foil extending over sides; spray with cooking spray. Prepare dough as directed; spread onto bottom of prepared pan. Bake 20 min. or until toothpick inserted in center comes out clean. Cool in pan. Use foil handles to remove dessert from pan before cutting into bars.