Scrub the potatoes and cut each lengthwise into 6 to 8 wedges, roughly ¾ inch thick. Place in a bowl, cover with cold water, and soak for 30 minutes.
Drain the wedges and pat completely dry with a clean towel. Any remaining moisture will keep them from crisping.
Toss the dry wedges with the olive oil until evenly coated.
In a shallow bowl, whisk together the flour, garlic powder, onion powder, paprika, salt, pepper, and parsley.
Working in batches, dredge the oiled wedges in the seasoned flour, pressing lightly so it adheres. Shake off the excess.
Preheat the air fryer to 400°F for 3 to 5 minutes. Lightly spray the basket.
Arrange the wedges in a single layer with space between them, working in batches as needed. Spray the tops with cooking spray.
Air fry for 18 to 22 minutes, flipping and spraying again at the halfway point, until deep golden and fork-tender.
If using buffalo sauce, transfer the hot wedges to a large bowl and toss until coated. Serve immediately with ranch or blue cheese dressing.