Let's just all agree that Crock-Pot soup recipes are the best. While they do require a little bit of planning, most are as simple as dumping in the ingredients and letting the slow cooker take over.
Cover and cook on High for 3½–4 hours or Low for 5–7 hours, until the vegetables are ... return to the slow cooker pot and mix thoroughly to thicken the soup. Stir in enough milk or water ...