Cut the potatoes: Slice the potatoes into even sticks, about 1/4 to 1/3 inch thick. Uniform size helps them cook evenly.
Soak: Place the cut fries in a bowl of cold water for 20–30 minutes.
This pulls off surface starch and helps them crisp.
Dry thoroughly: Drain and pat the fries very dry with clean towels. Any excess water will steam the potatoes instead of crisping them.
Season: In a large bowl, toss the fries with olive oil, oregano, garlic powder, smoked paprika (if using), salt, and black pepper until evenly coated.
Preheat the air fryer: Heat your air fryer to 380°F (193°C) for 3–5 minutes. A preheated basket helps the fries start crisping immediately.
Arrange and cook: Spread the fries in a single layer in the basket.
Avoid overcrowding; cook in batches if needed. Air fry for 12–16 minutes, shaking the basket halfway through. Cook until the fries are golden and crisp at the edges.
Add feta and zest: Transfer hot fries to a bowl.
Toss gently with crumbled feta and lemon zest. The residual heat softens the feta slightly without melting it completely.
Finish and serve: Sprinkle with a pinch more oregano and chopped herbs if you like. Taste and add a little extra salt if needed.
Serve immediately with lemon wedges.