Preheat the air fryer to 400°F (200°C) for 3–5 minutes.
A hot basket helps prevent sticking and gives a better texture.
Pat the tilapia dry with paper towels. Removing extra moisture helps the seasoning stick and improves browning.
Mix the seasoning: In a small bowl, combine garlic powder, paprika, onion powder, oregano, salt, and black pepper. Zest half the lemon and add the zest to the mix.
Oil and season: Drizzle the fillets with olive oil on both sides.
Sprinkle the seasoning evenly over each fillet, gently pressing it in so it adheres.
Prepare the basket: Lightly spray the air fryer basket with cooking spray. Arrange the fillets in a single layer, seasoned side up. Avoid overlapping.
Cook for 7–10 minutes at 400°F (200°C).
Thin fillets may be done in 7 minutes; thicker ones can take up to 10. The fish is ready when it flakes easily with a fork and reaches an internal temperature of 145°F (63°C).
Finish with lemon: Squeeze fresh lemon juice over the cooked fillets. Add chopped parsley if you like.
Serve immediately with your favorite sides—steamed green beans, quinoa, roasted potatoes, or a crisp salad.