Scalloped Potatoes with onion

2 medium potatoes , 2 1/2 cups peeled, washed, and thinly sliced 2 tablespoons butter or 2 tablespoons margarine 2 tablespoons all-purpose flour 1 cup milk[...]

2 cups sliced mushrooms 3/4 cup sliced onion rings 1/4 cup flour 2 cups skim milk 1 tablespoon minced dill or 1/2 teaspoon dried dill 1 teaspoon[...]

2 cups sliced mushrooms 3/4 cup sliced onion rings 1/4 cup flour 2 cups skim milk 1 tablespoon minced dill or 1/2 teaspoon dried dill 1 teaspoon[...]