Scalloped Potatoes
["3 Tbsp. butter", "2 Tbsp. all-purpose flour", "1 1/2 tsp. salt", "6 c. milk", "6 c. potatoes, pared and thinly sliced"]
["Make white sauce of first 4 ingredients.", "Place the potatoes in a greased 2-quart casserole.", "Cover with sauce.", "Cover casserole and bake for 1 hour.", "Uncover and bake 30 minutes longer."]
["butter", "flour", "salt", "milk", "potatoes"]