Beat the egg in a large bowl until it becomes light and lemon colored. Gradually beat in the sugar. Beat until the mixture thickens. Combine the flour, baking powder and salt in a second bowl. Add the dry ingredients, alternating with additions of the melted butter, milk and vanilla, to the egg mixture. Stir until the flour is moistened. Chill for 1 hour. Preheat the oil in the deep fryer. Roll out on a lightly floured board to a thickness of 1/2". Cut using a floured doughnut cutter. Fry until golden brown (about 1 minute per side). Drain. Sprinkle with powdered sugar. Recipe By :