I set mine to 380 °F (about 193 °C) and let it run for 5 minutes. Preheating helps you get that immediate sear and prevents sticking.
In a small bowl, I stir together the mustard, honey, garlic powder, and smoked paprika until smooth and uniform. This glaze is the flavor heart of the dish.
I gently pat the salmon filets dry, season them with salt and pepper, then brush the glaze generously over the top and sides. I save a little glaze aside for drizzling after cooking.
I place the filets in the basket (skin side down if skin-on) in a single layer, then air fry at 380 °F for about 10–12 minutes. The salmon is done when it flakes easily and reaches an internal temperature of 145 °F (63 °C).
Once cooked, I transfer them to a plate and immediately drizzle the reserved glaze over, then top with fresh dill or parsley and lemon slices. Serve right away for the best texture.