Cover and cook for 4 hours on low. Season with salt and pepper, to taste.
Serve in individual bowls with the toppings.
Notes
Note on nutrition info: Nutrition information does not include the toppings as those are optional.
Protein addition: 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.
Fridge storage: This soup should last up to 3 to 4 days covered in the fridge.
Freezer storage: To freeze, let the soup cool first and store it in labeled, freezer-safe containers for up to 3 months (without the toppings). Thaw in the fridge.
Reheating: Reheat in a pot on the stove over medium heat.
Don't overfill: Slow cookers should not be more than ⅔ full. Too much liquid can cause the soup to overflow.
Avoid the temptation to lift the lid: Every time you lift the lid, you lose heat and extend the cooking time. If the clear glass lid is steamed up, I just give the slow cooker a gentle shake and as the steam runs down it becomes clear for viewing, at least for a short time.
Adjust seasoning at the end: Slow cooking can dilute the flavors. Taste and adjust the seasoning at the end of the cooking time.