Place a large salmon fillet, or smaller individually cut salmon fillets, on a rimmed baking sheet. Sprinkle generously with salt and pepper.: You will feel the cool, slightly slick surface of the salmon as you arrange it, and the sound of the fillets settling on the sheet should be gentle. Laying the fillets skin side down helps protect the flesh and keeps moisture in. Make sure the fillets are spaced so air can circulate, otherwise they steam instead of roast, which prevents a crisp top. A common mistake is crowding the pan, which lengthens cook time and leads to uneven doneness.
Brush the tops of the salmon fillets with pesto. Then sprinkle the tops with Panko breadcrumbs. Drizzle olive oil over the panko.: The grains of salt should be visible, and the pepper gives a light speckled look. Salt draws out moisture briefly, then seasons the flesh so the flavor penetrates. I usually use a moderate hand with the salt, especially if using a salty pesto. Avoid dumping too much seasoning at once, because you can always add more after cooking but you cannot remove excess.
In the oven: Preheat the oven to 400°F. Once hot, place the salmon in the oven and bake for 10 to 12 minutes, until the top is golden.: As you spread the basil pesto , you will notice its glossy, herb studded texture and bright green color. Brushing helps the pesto cling to the fish and form a flavorful barrier during cooking. Go for an even thin layer so it heats through without burning. A mistake to watch for is applying a heavy paste that sits like a mound, which can insulate the fish and prevent even cooking.
In the air fryer: Preheat the air fryer to 400°F. Once hot, carefully lower the salmon into the air fryer basket. Air fry for 5 to 7 minutes until the top is crispy.: Lightly scatter the panko breadcrumbs so they create a loose, airy coat over the pesto. The crumbs will sit on top and, once oiled and cooked, turn to a golden crust. Pressing the crumbs too firmly will compress them and make the texture dense instead of crisp, so keep the application gentle.
Drizzle olive oil over the panko: The thin stream of olive oil should just moisten the crumbs enough to promote browning. The oil sizzles when it meets heat, and that first scent of toasting crumbs is a cue the crust will be successful. Use only a small amount, since excessive oil will pool and make the topping greasy rather than crisp.
Preheat the oven to 400°F: The oven should be hot and steady at four hundred degrees before the fish goes in, which ensures quick set of the crust and gentle cooking of the interior. You will feel the blast of heat when you open the oven, and the preheated environment keeps cook times consistent. Skipping this preheat extends the time the fish spends in warming air, which can dry it out.
Once hot, place the salmon in the oven and bake for 10 to 12 minutes, until the top is golden: The air in the oven will smell faintly of toasted crumbs and warm herbs as the pesto warms and the panko browns. You want to see a light golden color on top and the edges of the fish starting to flake. Use a fork to check for gentle flake at the thickest part, and watch closely because a minute or two can change the texture from moist to dry. Overbaking is the most common misstep here, so remove the fish as soon as it flakes easily.
Preheat the air fryer to 400°F: When using the air fryer , preheat so the basket is hot and can instantly crisp the topping. The device will hiss and circulate hot air, giving you faster browning than a cold start. Not preheating can result in a soggy crust and longer cook times, so take the minute to warm it up.
Once hot, carefully lower the salmon into the air fryer basket: Handling the fillets gently will preserve the coating and keep everything intact. You may hear a soft sizzle when the fish meets the hot surface, and that immediate heat helps set the pesto and crisp the crumbs. Avoid stacking pieces or crowding the basket, which blocks airflow and reduces crispness.
Air fry for 5 to 7 minutes until the top is crispy: In the air fryer, the circulation creates a rapid toasting effect, and you will notice a pronounced crunch forming on the surface within minutes. Check the fish at the lower end of the time range for a tender interior and remove promptly when the flesh flakes. Leaving it in even a few extra minutes can quickly overcook thin portions, so trust the flake test rather than the clock alone.