1. Combine the Macphie American Carrot Cake Mix, water and carrots with a beater and beat for 1 minute on slow speed and 3 minutes on 2nd speed.
  2. Deposit into two round tins and bake for 30 minutes at 180°C (360°F).
  3. Once cooled, layer and top with Macphie Rainbow Cream Cheese Frosting.
  4. Decorate with chopped walnuts.