1/4 c. butter
1/4 c. flour
1/2 tsp. salt
1 c. milk
1/2 lb. Velveeta cheese
4 well beaten egg yolks
4 stiff beaten egg whites

Melt butter in double boiler; add flour and salt; blend. Add milk; cook, stirring constantly until thick and smooth. Add cheese; stir until melted. Gradually add sauce to egg yolks. Carefully fold in egg whites beaten stiff but not dry. Pour in ungreased baking dish. Bake in pan of hot water in moderately slow oven (325 degrees) 1 hour and 15 minutes or until mixture doesn't adhere to knife. Serves 6.