Combine all ingredients in your Crock Pot. Cover and cook on low all day, at least 8 hours. One hour before serving, turn Crock Pot to high.
To serve, place about 1/2 a cup of cooked rice in each bowl and ladle the soup over the rice. Or leave the rice out if you prefer and give each person a generous serving of the soup.
Garnish with any or all of these toppings: sliced avocado or guacamole, cilantro, sour cream, creme fraiche, crushed blue corn tortilla chips, raw cheddar.