Pat the salmon fillets dry with paper towels, then brush lightly with olive oil and season generously with salt and pepper.
Preheat your air fryer to 400°F (200°C) for about 3 minutes, ensuring it's hot enough for crispy skin.
Carefully place the salmon fillets skin-side down into the air fryer basket, making sure they aren’t touching to allow even crisping.
Cook the salmon for 8-10 minutes, checking halfway through; the skin should be bubbling and golden brown, and the flesh will look opaque and flaky when done.
Meanwhile, melt the butter in a small saucepan over medium heat, then add the minced garlic. Sauté for about 1 minute until fragrant and slightly golden.
Stir in lemon juice and cook for another 30 seconds, allowing the flavors to meld into a bright, aromatic sauce.
Once the salmon is cooked, carefully transfer the fillets to serving plates, skin-side up to keep the crispy texture intact.
Drizzle the warm garlic lemon butter sauce generously over the hot salmon fillets, letting it seep into the flaky flesh.
Garnish with chopped parsley or dill if desired, and serve immediately to enjoy the crispy skin and tender, flavorful flesh.