Prep Salmon: Remove skin from salmon and cut it into bite-sized pieces with a sharp knife.
In a medium bowl, combine the marinade ingredients including the avocado oil, low-sodium soy sauce, honey, garlic, and grated ginger root. Stir or whisk together until well-combined. Note: do not add the cornstarch or water yet.
Add the salmon chunks to the marinade mixture and be sure each piece is coated. Let the salmon marinate for 15 minutes up to 1 hour.
Line the air fryer basket with parchment paper. Place the salmon cubes in a single layer in the air fryer basket. Air fry at 390 degrees F/200 degrees C for 6-8 minutes. There is no need to flip or shake it. Salmon is done when it is golden brown and reaches an internal temperature of 145℉/63°C. Note: Do not toss out the extra marinade because you will use it to make the sauce. Make the sauce while the salmon is cooking. In a small bowl, combine the cornstarch and water and whisk into a slurry. Add it to the remaining marinade. Heat it in a small saucepan over medium heat until it starts to bubble. Reduce to medium-low and continue to heat, stirring frequently, for 1-2 minutes.
When the salmon is done cooking, place it in a serving dish and pour however much of the sauce you desire on top.
Hint: for best results spread the salmon in an even layer with space between so that air can circulate. This helps to cook the salmon evenly.