Company Scalloped Potatoes
["1 lb. fresh sliced mushrooms or 2 (6 oz.) cans", "1 1/2 lb. peeled potatoes", "3 Tbsp. butter", "1 can cream of chicken soup", "1/4 c. milk", "1/4 c. onion, chopped fine", "1/2 c. shredded sharp Cheddar cheese", "1/4 tsp. paprika"]
["Cook potatoes in salted water until barely tender; cut in 1/2-inch slices. Saute mushrooms in butter. Butter a 1 1/2-quart casserole and layer potatoes and mushrooms alternately. Heat soup, milk and onions; pour over potatoes. Sprinkle cheese and paprika over top. Bake, uncovered, at 400\u00b0 for about 15 to 20 minutes."]
["mushrooms", "potatoes", "butter", "cream of chicken soup", "milk", "onion", "Cheddar cheese", "paprika"]