Place salmon fillets into a 6" round baking pan. Brush each with butter and sprinkle with chili powder, salt, pepper and garlic.
Place jalapeño slices on top and around salmon. Pour half of the lime juice over the salmon and cover with foil. Place pan into the air fryer basket.
Adjust the temperature to 370°F and set the timer for 12 minutes.
When fully cooked, salmon should flake easily with a fork and reach an internal temperature of at least 145°F.
To serve, spritz with remaining lime juice and garnish with cilantro.
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.