Soak the chips: Place the cut potatoes in a bowl of cold water for 20–30 minutes. This removes excess starch and helps them crisp up.
Pat them very dry with a clean towel.
Preheat the air fryer: Set it to 200°C/400°F for about 5 minutes. A hot basket gives you a better crust.
Season the chips: Toss the dry potato sticks with olive oil, garlic powder, smoked paprika, salt, and pepper. Coat evenly.
Cook the chips (first round): Air fry the chips in a single layer at 200°C/400°F for 12–15 minutes, shaking halfway.
They should start to color but not be fully crisp yet.
Mix the crumb: In a shallow dish, combine panko, fine breadcrumbs (or crushed cornflakes), garlic powder, onion powder, paprika, cayenne (if using), lemon zest, salt, and pepper.
Prepare the fish: Pat the fillets dry. Season lightly with salt and pepper. Set up three bowls: flour, beaten eggs, and the breadcrumb mix.
Crumb the fish: Dredge each piece in flour (shake off excess), dip in egg, then press firmly into the breadcrumb mix.
Press well so the coating adheres.
Start the tartare: In a bowl, mix Greek yoghurt, mayonnaise, chopped pickles, capers, onion, dill, Dijon, and lemon juice. Season with salt and pepper. Adjust lemon and dill to taste.
Chill until serving.
Cook the fish: Lightly spray both sides of the crumbed fish with olive oil. Place in the air fryer basket in a single layer. Cook at 200°C/400°F for 8–10 minutes, flipping halfway, until golden and the fish flakes easily.
Thicker fillets may need 1–2 extra minutes.
Finish the chips: Return the chips to the air fryer (or keep cooking in a second drawer if you have one). Cook another 5–8 minutes at 200°C/400°F until deeply golden and crisp. Season with salt immediately after cooking.
Serve: Plate up the fish with a pile of hot chips, a generous scoop of yoghurt tartare, and lemon wedges.
Add extra dill or parsley if you like.