Combine butter and wafer crumbs in a 13- x 9- x 2-inch baking pan; press into bottom of pan. Sprinkle with chocolate morsels and pecans. Remove lid from caramel topping; microwave at HIGH 1 to 1-1/2 minutes or until hot, stirring after 30 seconds. Drizzle over pecans. Bake at 350 degrees F. for 12 to 15 minutes or until morsels melt; cool in pan on a wire rack. Chill at least 30 minutes; cut into squares.