Fry 2 to 3 doughnuts at a time, until the undersides of the doughnuts are golden brown. Gently turn doughnuts over once and finish frying the other side.
Lift doughnuts out of the oil using a slotted spoon and drain on paper towels.
*Repeat with remaining dough. With a Wilton Disposable Decorating Bag and Tip 230, fill with jam.