In a small bowl, combine soup with milk. In removable liner, layer one half the potatoes and one half the chopped onions; spread one half the soup-milk mixture. Repeat layering using rest of ingredients. Placed in base. Cover and cook on low for 6-8 hours, high for 3-4 hours or auto for 5 hours. Variation: Potatoes O'brien ~Prepare same as above but add 1 chopped pepper and 2 chopped pimientos to the chopped onion.