Preheat the air fryer to 390°F (200°C) for 3–5 minutes. A hot basket helps the glaze caramelize and the salmon cook evenly.
Pat the salmon dry. Use paper towels to remove excess moisture. This helps the glaze stick and prevents steaming.
Make the glaze. In a small bowl, whisk together maple syrup, soy sauce, Dijon, minced garlic, lemon zest, lemon juice, oil, black pepper, and a pinch of red pepper flakes if you like heat.
Season lightly with salt. Taste the glaze.
If your soy sauce is salty, add just a small pinch of salt to the salmon or skip it entirely.
Coat the salmon. Brush or spoon about two-thirds of the glaze over the tops and sides of the fillets. Reserve the rest for basting later.
Prep the basket. Lightly spray the air fryer basket or line it with perforated parchment made for air fryers. Avoid regular parchment that can block airflow.
Air fry, skin-side down. Place fillets in a single layer with a little space between them.
Cook for 6 minutes.
Baste and finish. Open the basket, brush with the remaining glaze, and cook 2–4 more minutes. Aim for 125–130°F internal temperature for medium, or 145°F if you prefer fully cooked.
Rest briefly. Let the salmon sit for 2–3 minutes. This keeps it juicy and lets the glaze set.
Garnish and serve. Sprinkle with sesame seeds or parsley if you like.
Add lemon wedges on the side. Serve with rice, quinoa, or steamed veggies.