Mix the dry ingredients and gradually add the scalded milk. Cook in a double boiler, stirring constantly until the mixture thickens, about 15 minutes. Add the slightly beaten eggs and cook for 2 or 3 minutes longer. Cool and add the vanilla. If you wish a richer filling, add 2 tablespoons butter. Variations: Banana Cream Pie: Put the layers together with cream filling to which has been added one thoroughly mashed banana. Washington Pie: Make like Boston Cream Pie, putting the layers together with cherry jam.