Au Gratin Potatoes
["2 Tbsp. margarine", "2 Tbsp. flour", "1 tsp. salt", "1 c. milk", "1 c. grated cheese", "2 c. cooked, cubed potatoes"]
["Melt margarine in saucepan; blend in flour and salt.", "Add milk gradually; cook until thickened, stirring constantly.", "Add cheese; stir until melted.", "Remove from heat.", "Place potatoes in a greased baking dish; cover with cheese sauce.", "Bake at 400\u00b0 for 30 to 40 minutes."]
["margarine", "flour", "salt", "milk", "grated cheese", "potatoes"]