Chop the sweet potato into 1-inch cubes. Heat oil in a medium sauce pan. Dice the onion, green pepper, garlic and chipotle spice. Add to the pan and cook until the onion is translucent.
Stir in the chili powder, cumin, and coriander and cook for another minute. Stir in the sweet potato, then add the diced tomatoes, beans, corn, water and salt. Bring the chili to a boil, then lower the heat to a simmer for 40 minutes or until sweet potato is cooked through. Adjust seasoning to taste. Garnish with your favorite chili toppings.