This hearty and flavorful soup is so easy to make...simply mix the ingredients in a slow cooker and let it do the work for you. And to make it even better, stir in Cheddar just before serving and top with a sprinkle of chives.
This casserole makes a quick, well-balanced meal with things you have on hand! If you don't have spinach you can substitute it for a vegetable you do have!