Scalloped Potatoes(Microwave)  
["3 Tbsp. butter or margarine", "1/2 c. chopped onion", "3 Tbsp. all-purpose flour", "1/2 tsp. salt", "1/8 tsp. pepper", "1 1/2 c. milk", "4 medium potatoes, peeled"]
["In 2-quart casserole combine butter and onion.", "Microwave at High for 1 to 2 minutes or until butter melts.", "Stir in flour, salt and pepper.", "Blend in milk.", "Microwave at High 5 to 7 minutes, or until thickened, stirring after first 2 minutes and then after every minute.", "Cut potatoes in half lengthwise, then crosswise into 1/4-inch slices.", "Add to thickened sauce.", "Cover.", "Microwave at High for 10 to 15 minutes, or until potatoes are fork-tender, stirring every 5 minutes.", "Let stand, covered, for 5 minutes."]
["butter", "onion", "flour", "salt", "pepper", "milk", "potatoes"]