Scalloped Potatoes
["3 Tbsp. butter", "2 Tbsp. flour", "1 tsp. salt", "1/4 tsp. pepper", "2 c. milk", "3 1/2 to 4 c. thinly sliced white potatoes (about 3 medium)", "2 Tbsp. minced onion", "1/2 c. shredded sharp cheese (optional)"]
["Place butter in 1-quart measuring cup.", "Microwave at High 1 to 2 minutes, or until melted.", "Blend in flour and seasonings. Gradually stir in milk.", "Microwave at High 8 to 10 minutes, stirring after 4 minutes.", "Layer half of potatoes, onion and sauce in greased 2-quart casserole.", "Repeat layers.", "Cover.", "Microwave at Medium-high 17 to 19 minutes.", "Remove from oven; let stand 5 minutes before serving.", "Makes 4 to 6 servings."]
["butter", "flour", "salt", "pepper", "milk", "white potatoes", "onion", "sharp cheese"]