Place all the ingredients in a slow cooker and cook on low for 6-8 hours or on high for 4-5 hours. You can also cook it on high until it starts to boil and then turn the setting on low until you're ready to serve the soup. Soup is best when it's had about an hour to sit after removing from heat. Top with
Sourdough Garlic-Herb Croutons. Makes 8 1 1/2-cup servings.