Scalloped Potatoes
["2 Tbsp. butter", "2 Tbsp. flour", "2 c. milk or sour milk", "1/2 chopped onion", "3 1/2 c. sliced potatoes", "1/4 tsp. seasoned pepper", "1/4 tsp. salt"]
["Melt butter. Blend in flour; add milk. Cook over low heat until thickens, stirring constantly. Add salt, pepper and onion. Stir with potatoes in a casserole dish. Bake, covered, at 350\u00b0 for 30 minutes; then uncover for 30 minutes more."]
["butter", "flour", "milk", "onion", "potatoes", "pepper", "salt"]