Preheat the air fryer: Set to 390°F (200°C). Preheating helps crisp the top and ensures even cooking.
Prep the basket: Lightly brush or spray the basket with olive oil to prevent sticking, especially if your salmon is skinless.
Season the salmon: Pat fillets dry with paper towels.
Sprinkle both sides with salt and pepper. Place them skin-side down if they have skin.
Mix the pesto topping: Stir the pesto with lemon zest and 1 tablespoon lemon juice. Taste and adjust with a pinch of salt or more lemon if needed.
Spread the pesto: Spoon about 1 heaping tablespoon of pesto over each fillet.
Spread to coat the top evenly without letting it drip down the sides too much.
Arrange in the basket: Place fillets in a single layer with a little space between them. If adding vegetables, toss them lightly with salt, pepper, and a teaspoon of oil, and arrange around the salmon.
Air fry: Cook for 7–10 minutes, depending on thickness. A 1-inch-thick fillet usually takes about 8 minutes.
You’re aiming for an internal temperature of 125–130°F for medium, or up to 135°F for more well-done.
Finish with lemon: Transfer salmon to plates and squeeze more lemon juice over the top. Add extra pesto or a sprinkle of Parmesan if you like.
Serve: Pair with rice, couscous, roasted potatoes, a green salad, or steamed vegetables. The pesto sauce naturally blends into any side.