Preheat your air fryer to 400°F (200°C). While it heats, pat the salmon fillets dry with paper towels and brush them lightly with olive oil to help the skin crisp up.
Season the fillets generously with salt and pepper, ensuring the skin side is well coated for maximum crispiness.
Place the salmon fillets skin-side down in the air fryer basket, making sure they are not touching to allow even cooking.
Cook the salmon in the air fryer for about 10-12 minutes, or until the skin is golden and crispy, and the flesh flakes easily when tested with a fork.
Meanwhile, prepare the garlic butter sauce by whisking together the melted butter, minced garlic, lemon juice, and chopped herbs in a bowl. Set aside.
Once the salmon is cooked, carefully transfer the fillets to a serving plate. Spoon the warm garlic butter sauce over the top, allowing the flavors to meld.
Serve immediately, enjoying the crispy skin and tender flesh with the fragrant garlic butter drizzled on top for a delicious finish.