Preheat the air fryer: Set it to 400°F (200°C) for 3–5 minutes. A hot basket helps create a quick sear and prevents sticking.
Pat the fish dry: Use paper towels to remove surface moisture.
Dry fish browns better and won’t steam.
Mix the seasoning: In a small bowl, combine salt, pepper, garlic powder, smoked paprika, onion powder, and cayenne if using. Add lemon zest.
Oil and season: Drizzle fish with olive oil on both sides. Sprinkle the spice blend evenly, pressing it gently so it adheres.
Prepare the basket: Lightly spray the air fryer basket with nonstick cooking spray.
If your fish has skin, place it skin-side down.
Cook: Air fry at 400°F (200°C) for 7–10 minutes, depending on thickness. Thinner fillets (tilapia) may be done in 6–7 minutes; thicker fillets (cod, salmon) need 9–11 minutes.
Check doneness: The fish should flake easily with a fork and reach an internal temperature of 145°F (63°C). The surface should look lightly charred around the edges.
Finish with lemon: Transfer to a plate and immediately squeeze fresh lemon juice over the top.
Garnish with chopped herbs.
Serve: Plate with lemon wedges. Pair with roasted veggies, a simple salad, or rice and a quick yogurt sauce.