In a medium-sized ungreased casserole dish or glass baking dish, distribute evenly the thinly sliced potatoes covering the bottom of the dish. Create layers by next using half of the chopped onion, and distribute evenly over the potatoes, followed by 1/4 cup of the cheese. Dot with a tablespoon of butter.
Mix the cream of chicken soup, milk and Mrs. Dash seasoning together, then spoon one-half of the soup/sauce over top of the onion, butter, and potato mixture.
Repeat next layer with potatoes, followed by onions then 1/4 cup of the cheese,and dot with butter. Cover with the remaining soup/sauce, top with the remaining cheese, dot with remaining butter and sprinkle with paprika for garnish.