In small microwavable bowl, microwave chocolate chips uncovered on High 30 to 60 seconds, stirring halfway through, until chips can be stirred smooth. Spoon into resealable food-storage plastic bag; partially seal bag. Cut small tip from corner of bag; drizzle chocolate over top. Let stand about 1 hour or until chocolate is set. To serve, cut into 6 rows by 4 rows. Store covered in airtight container at room temperature.