Scalloped Potatoes

6 medium potatoes 1 medium onion 3 tablespoons butter 2 tablespoons flour, all-purpose 2 tablespoons parsley leaves 3 cups milk 5 slices american cheese 1 x[...]

3 teaspoons butter 2 teaspoons flour, all-purpose 2 teaspoons salt 2 teaspoons black pepper 3 cups milk 6 medium potatoes pared and thinly slicked 2 teaspoons[...]