Scalloped Potatoes without pimento sausage cream

6 medium potatoes , peeled and thinly sliced 1 onion , thinly sliced 3 tablespoons butter or 3 tablespoons margarine 1/4 cup chopped onion 3 tablespoons[...]

5 large potatoes , peeled and thinly sliced 3/4 cup onion , chopped 3 tablespoons butter or 3 tablespoons margarine 1/4 cup flour 1 3/4 cups chicken broth 2[...]