1. Heat the oil in a large heavy pot. Add the onion, bell pepper, and garlic and cook mixing constantly for about 5 minutes or until the onions get translucent.
2. Add the chicken and cook 5 minutes more stirring continuously.
3. Add the next 5 ingredients (through diced tomatoes) and stir until combined. Bring to a boil. Cover and reduce heat. Simmer for 10 minutes.
4. Combine the cornmeal and water in a small bowl. Add to chicken mixture, stirring well. Simmer uncovered for 10 minutes. Add salt and pepper to taste.
5. Serve warm.