In a large Dutch oven or stock pot, add the chili, black beans, chickpeas, corn, tomatoes, peas and carrots, green chilies, taco seasoning, salt, and pepper. Stir well to combine.
Bring the mixture to a boil over high heat, then reduce the heat and let it simmer for 15–20 minutes, until heated through and slightly thickened.
If using cooked rice or shredded chicken, stir it in and let the soup simmer for another 5 minutes or until warmed through
Ladle into bowls and top with sour cream, shredded cheese, scallions, or tortilla chips as desired.