Preheat your air fryer to 390°F. Remove the skin from the salmon filets and cut the salmon into 1-inch cubes.
In a bowl, season the cubed salmon with kosher salt, pepper, and onion powder.
Arrange the salmon pieces in a single layer in the air fryer basket. Cook for 6-8 minutes, or until the internal temperature reaches 125°F. Alternatively, you can pan-fry the salmon over medium-high heat in a skillet for the same duration if preferred.