In small microwavable bowl, microwave white chocolate chunks and oil on High 30 to 45 seconds, stiring oncer; until melted and smooth. Place melted chocolate in small resealable food-storage plastic bag; seal bag. Cut 1/8-inch hole in bottom corner of bag. Squeeze bag gently to drizzle white chocolate over cookies. Plaved on waxed paper; Let stand until set. Store tightly covered between sheets of waxed paper.