Whisk. In a small bowl combine Truvia, soy sauce, hot water, miso, garlic, ginger and pepper. Whisk to combine. If you are not keto/low carb, use brown sugar.
Spray air fryer basket with nonstick vegetable oil spray. Place the sauce-covered salmon into the air fryer basket. Set fryer to 400°F for 12 minutes. Halfway through, brush additional miso sauce on top.