We got this recipe from one of our Milwaukee customers.
Preheat oven to 350 degrees and put oven rack in middle position. Grease a 9x5 inch loaf pan with butter and flour. In medium bowl, combine flour, baking powder and salt and set aside. In a food processor, process sugar, eggs and vanilla for about 5 seconds. With machine running, and after stirring the melted butter well, to mix in the separated solids, pour butter through feed tube in a slow and steady stream. Transfer egg mixture to large bowl and sift in flour mixture in 3 parts. Incorporate flour gently, until just combined, using a large whisk. Pour batter into prepared pan and bake for 15 minutes. Lower oven temperature to 325 degrees and bake until deep golden brown and tester comes out clean. It should take about 35-40 minutes. Rotate pan halfway through the baking time. Cool in pan for 10 minutes, unmold and let cool completely on a wire rack.