Heat oil (2 to 3 inches) in deep-fat fryer or heavy kettle to 375 F. Beat 1 1/2 cups of the flour and the remaining ingredients in large mixer bowl on low speed, scraping bowl constantly, 30 seconds. Beat on medium speed, scraping bowl occasionally, 2 minutes. Stir in remaining flour.
Turn dough onto well-floured cloth-covered board; roll around lightly to coat with flour. Roll gently 3/8 inch thick. Cut with floured doughnut cutter. Slide doughnuts into hot oil with wide spatula. Turn doughnuts as they rise to surface. Fry until golden brown, 1 to 1 1/2 minutes on each side.
Remove from oil; do not prick doughnuts. Drain on paper towels.
Serve plain, sugared or frosted. 2 dozen doughnuts.
Serving Size: 8
