Au Gratin Potatoes
["2 Tbsp. butter", "2 Tbsp. flour", "1/4 tsp. salt", "1 c. milk"]
["Melt butter in saucepan.", "Blend in flour and salt.", "Remove from heat and stir in milk with wire whisk.", "Place on medium heat and stir constantly until the mixture thickens and bubbles.", "Cook and stir 1 minute longer."]
["butter", "flour", "salt", "milk"]