Add all ingredients to a crockpot except cilantro leaves, cornmeal, and water to a crockpot. Stir and season with salt and pepper.
Cover and cook on High for 4 hours or low for 6 hours.
20-30 minutes before the chili finishes cooking, mix the cornmeal with water to make a paste. Then stir the paste into the crockpot. Add the chopped cilantro. Cook for a final 20-30 minutes.
Serve with sour cream, chopped green onions, shredded cheese, or tortilla chips as toppings, if desired.