In small microwavable bowl, microwave remaining 2 tablespoons white vanilla baking chips uncovered on High 30 to 45 seconds or until chips can be stirred smooth. Spoon melted chips into small resealable food-storage plastic bag; partially seal bag. Cut off tiny corner of bag. Squeeze bag to pipe over top of chocolate bar. Cool completely, about 1 hour. Cut into 6 rows by 4 rows. Store covered in airtight container.