Preheat the air fryer to 400°F (200°C) for even cooking and a crispy finish.
Pat the salmon fillets dry with a paper towel.
Drizzle olive oil or melted butter over the salmon and rub to coat evenly.
Season both sides with garlic powder, onion powder, smoked paprika, salt, and pepper.
(Optional) Mix marinade ingredients and brush over the salmon for extra flavor.
Place the salmon skin-side down in the air fryer basket.
Cook the salmon at 400°F (200°C) for 8-10 minutes until crispy on the outside and tender inside.
Check doneness with a meat thermometer—internal temperature should be 145°F (63°C).
Garnish with fresh lemon slices or lemon zest before serving.
Serve immediately with your favorite sides.