Scalloped Potatoes
["1/3 c. margarine", "1/2 c. minced onion", "1/3 c. flour", "3 c. milk", "2 1/2 c. grated Cheddar cheese", "1 Tbsp. salt", "1/4 tsp. dry mustard", "1/8 tsp. pepper (black)", "10 c. thinly sliced potatoes", "1/4 tsp. paprika"]
["In medium saucepan, melt margarine.", "Add onion and saute until soft.", "Stir in flour.", "Cook over low heat for 1 minute.", "Gradually add milk, stirring constantly.", "Cook over medium heat until slightly thickened and begins to boil.", "Add 1 cup cheese, salt, mustard and pepper.", "Remove from heat; stir until cheese is melted."]
["margarine", "onion", "flour", "milk", "Cheddar cheese", "salt", "dry mustard", "pepper", "potatoes", "paprika"]