Cream Soup Base / Cream Soup Substitute

"There are a few substitute recipes on here for specific cream based soups (Cream of Something soups) but this one is quite different in that it does not use powdered milk or is it specific to one flavor of soup. I like using this as a thickening base for skillet meals or casseroles that call for the creamed soups but where I can have just a base soup to work with and not be lead to one specific flavor. You can add chopped herbs or sauteed chopped mushrooms or celery to flavor it in a certain direction or use as is in your main & side dishes...."