This is a very popular breakfast casserole at our family get-togethers. Obviously, you can make substitutions. If you don’t like sausage, you can substitute ham, Italian sausage, bacon or whatever. If you don’t want cream of mushroom soup, use cream of celery, cream of onion, or whatever cream soup you like. I make my own soup for this because of my food allergies. However, if you would like to use canned soup, use 1 can of soup and 1 can of milk.