Butter bottom of a 1 1/2 quart souffle dish. Sprinkle 1 to 2 tablespoons evenly over it. In a saucepan, whisk together the flour, 2 tablespoons sugar and 1/3 cup milk. Place over medium heat. Whisk in remaining milk, stirring until mixture thickens. Remove from heat, stir in 2 tablespoons butter, lightly beaten egg yolks and vanilla; set aside.
Beat whites with cream of tartar until peaks form. Sprinkle 1 tablespoon sugar over whites. Fold together. Spoon batter into souffle dish. Bake at 325 degrees for 50 to 55 minutes. Remove, sprinkle with sugar and serve.
