Mix the cinnamon and sugar together in a small plate and set aside. Wet the rim with the glass with a bit of water and place the rim on the cinnamon mixer. Fill the glass with ice to the top. Pour the Fireball Whiskey and Rumchata over the glass. Garnish with a cinnamon stick. Stir and enjoy.
Recipe by Chef Rosie at http://chefrosie.com/spiked-horchata-mothers-milk-cocktail/