In a small bowl, whisk together soy sauce, sesame oil, and minced garlic to create a quick marinade.
Place the salmon fillets in a shallow dish or zip-top bag and pour the marinade over, making sure they are well coated. Let them marinate for at least 10 minutes.
Preheat the air fryer to 400°F (200°C) and lightly spray the basket with oil to prevent sticking.
Remove the salmon from the marinade, letting excess drip off, and pat dry lightly if needed.
Spray the salmon fillets lightly with oil on both sides to promote crispiness, especially on the skin.
Place the salmon fillets skin-side down in the air fryer basket, making sure they don’t touch for even cooking.
Cook for about 8-10 minutes, flipping gently halfway through, until the skin is crispy and the flesh is opaque and flaky.
While the salmon cooks, toast the sesame seeds in a dry skillet over medium heat until golden and fragrant, about 2 minutes, shaking often.
Remove the cooked salmon from the air fryer and sprinkle generously with toasted sesame seeds and chopped green onions.
Serve immediately, enjoying the crispy sesame crust, tender flesh, and aromatic toppings.