In small microwavable bowl, mix remaining 1 tablespoon hazelnut spread and remaining 1 tablespoon chocolate chips. Microwave uncovered on High 45 to 60 seconds or until mixture can be stirred smooth. Spoon into resealable food-storage plastic bag. Seal bag; cut off tiny corner of bag. Sprinkle hearts with powdered sugar. Squeeze bag to drizzle each with chocolate mixture.