Heat the oil to 375 degrees.
Cut the onion halfway through from root to top. Slice the onion horizontally to make (cut) rings. Separate the onion slices into a bowl. Cover with milk for about an hour.
In a large bowl, mix together the flour, paprika, onion powder, salt and pepper.
Lift the onions from the milk, shake off the excess and toss them in the flour. Add the add the onions to the hot oil, after shaking off most of the flour.
Fry in batches, stirring occasionally to separate. Once the onions are brown and crisp (2-4 minutes), remove them from the oil and drain. Repeat with all of the onions.