PREHEAT oven to 350° F. Grease 8-inch-square baking pan.
PLACE whole bar of dough in prepared pan. Allow to soften for 5 to 10 minutes. Using fingertips, pat dough gently to fill pan.
BAKE for 24 to 26 minutes or until wooden pick inserted in center comes slightly sticky. Cool completely in pan on wire rack.
MICROWAVE morsels in small, heavy-duty plastic bag on HIGH (100%) power for 30 seconds; knead. Microwave at additional 10- to 15-second intervals, kneading until smooth. Cut tiny corner from bag; squeeze to drizzle over brownies. Cut into bars.