Cheddar Cheese Sauce
["1/4 c. margarine", "1/4 c. all-purpose flour", "2 c. milk", "2 c. Velveeta cheese", "1 tsp. dry mustard"]
["In double boiler, melt margarine; stir in flour. Remove from heat; gradually stir in milk. Cook over medium heat, stirring constantly, until thickened. Cook 2 additional minutes. Add cheese and cook until melted. Add mustard; stir in."]
["margarine", "all-purpose", "milk", "Velveeta cheese", "dry mustard"]