Preheat the air fryer: Set it to 390°F (200°C) for 3–5 minutes. A hot basket helps prevent sticking and gives better texture.
Pat the cod dry: Use paper towels to remove excess moisture. Dry fish browns better and won’t steam in the air fryer.
Make the herb oil: In a small bowl, mix olive oil, lemon juice, garlic, salt, pepper, and paprika. Stir in parsley, dill, chives, and lemon zest until combined.
Season the fillets: Lightly spray the air fryer basket. Brush both sides of the cod with the herb oil. Use about 2 teaspoons per fillet and reserve the rest for finishing.
Arrange in the basket: Place fillets in a single layer with space between them. If needed, cook in batches to avoid crowding.
Air fry: Cook for 7–10 minutes, depending on thickness. Start checking at 7 minutes. The fish should flake easily with a fork and reach 145°F in the thickest part.
Finish and rest: Transfer to plates, spoon the remaining herb oil on top, and let rest for 2 minutes. Squeeze with fresh lemon.
Serve: Add a sprinkle of extra herbs or flaky salt. Pair with roasted potatoes, a green salad, or steamed asparagus.