This was a favorite treat when we lived in Whittier, Alaska running the cruise ship operations for Princess Cruises. A small coffee shop opened up on the waterfront and we found this on their menu and they kindly shared the recipe with us!
Brownie Mix (or Homemade brownie recipe if you have THAT kind of time!)
Nuts (we like Macadamia but Walnuts are good too)
Mix together and bake!