Cheddar Cheese Sauce
["3 Tbsp. melted margarine or butter", "3 Tbsp. all-purpose flour", "1-1/2 c. milk", "1/2 tsp. salt", "1/4 tsp. dry mustard", "1 c. (4 oz. not packed down) shredded cheddar cheese"]
["Melt butter in heavy sauce pan over low heat; add flour stirring until smooth.", "Cook one minute, stirring constantly.", "Add milk, cook over medium heat, stirring until mixture is thickened and bubbly.", "Add cheese.", "Yield:", "2 cups."]
["margarine", "flour", "milk", "salt", "dry mustard", "cheddar cheese"]