Preheat oven to 325° F.
Finely chop peppermint Hershey Kisses. Place in a heat safe bowl and microwave in 20 second increments until melted. Set aside and let cool slightly
Gradually add sugar and melted Hershey Kisses, beating at low speed until smooth.
Frosted brownies can be stored in airtight container in fridge for up to 3 days.