Sprinkle chicken with pepper; place in a large nonstick skillet., In a large bowl, combine 1 cup broth, barbecue sauce, molasses, chile pepper and cinnamon; pour over chicken. Bring to a boil. Reduce heat; cover and simmer until a thermometer inserted in chicken reads 165°, 20-25 minutes. Shred meat with 2 forks and return to the skillet., Meanwhile, in a large saucepan, bring water and remaining broth to a boil. Slowly stir in grits and pumpkin. Reduce heat; cook and stir until thickened, 5-7 minutes. Stir in cheese until melted., Divide grits among 6 serving bowls; top each with 1/2 cup chicken mixture. Serve with tomato, sour cream, green onions and cilantro.