Cover and cook for 4 hours on low. Season with salt and pepper, to taste.
Serve in individual bowls with the toppings.
Notes
Nutrition information does not include the toppings as those are optional.
If you would like to add some protein, add 2 to 3 raw chicken breasts to the slow cooker along with the other ingredients. Cook on low for 4 to 6 hours, until the chicken is fully cooked. Remove the chicken to shred it with two forks and return it to the slow cooker.
This soup should last up to 3 to 4 days covered in the fridge.