Working with three doughnuts at a time, carefully lower the doughnuts into the hot oil and fry until golden brown on the underside, 2 to 3 minutes. Carefully turn the doughnuts over and fry for an additional 2 to 3 minutes, or until the other side is golden brown as well. Using a slotted spoon or a spider strainer
, remove the doughnuts to the paper towel-lined baking sheet. Repeat with the remaining doughnuts.