To make this Italian sausage gnocchi soup in a crockpot or slow cooker, brown the sausage and add all the ingredients except the gnocchi, spinach, and cheese. Cook on low for about 6 hours or on high for about 4 hours. Add the gnocchi about 20 minutes before serving.  Gnocchi should float to the top when they are done cooking.  Add spinach prior to soup prior to serving.  Serve with a sprinkle of Parmesan cheese.