Scalloped Potatoes
["1 1/2 c. thinly sliced onions", "4 1/2 c. thinly sliced potatoes", "3 t. salt, divided", "3 T. butter", "2 T. plus 1 t. flour", "1/8 t. pepper", "1 3/4 c. milk", "1/3 to 1/2 c. shredded Cheddar cheese (optional)"]
["Bring 1 inch of water to boil in a pan; add onions and potatoes and 2 teaspoons salt. Boil for 5 minutes, drain. Melt butter in saucepan, blend in flour, pepper and remaining teaspoon of salt. Add milk and cook until thickened, stirring constantly. Combine potatoes and onions with cream sauce. Place in a shallow baking dish and sprinkle cheese on top, if desired. Bake, uncovered, at 400 \u00b0 for 35 minutes or until golden and bubbly. Serves 4 to 5."]
["onions", "potatoes", "salt", "butter", "flour", "pepper", "milk", "Cheddar cheese"]