Prep the potatoes: wash, pat very dry with a clean towel, and halve them (quarter the big ones).
Season: toss with the olive oil, then sprinkle over the garlic powder, Italian seasoning, paprika, salt and pepper plus HALF of the parmesan; toss again.
Arrange in the air fryer basket in a single layer, cut-side down, with a little space between pieces; cook in two batches rather than stacking.
Air fry at 400°F (200°C) for 18–20 minutes, shaking the basket or flipping halfway, until the edges are deep golden and a fork slides easily into the largest piece.
Finish: tip into a serving bowl and immediately scatter over the remaining parmesan and the parsley, plus a squeeze of lemon if you like; serve straight away.