Preheat the air fryer: Set to 375°F (190°C) for 5 minutes. Line the basket with perforated parchment or lightly spray with oil.
Make the crab filling: In a bowl, mix the mayonnaise, cream cheese, Dijon, lemon juice, lemon zest, Old Bay, and garlic until smooth.
Fold in the crab, green onion, and parsley. Season with a pinch of salt and pepper. Taste and adjust lemon or Old Bay as needed.
Prep the salmon: Pat the fillets dry.
Using a sharp knife, cut a slit lengthwise down the center of each fillet to create a pocket, being careful not to cut all the way through. Lightly season the salmon with salt and pepper.
Stuff the salmon: Divide the crab mixture among the fillets, pressing it gently into the pockets and mounding a little on top if needed.
Add optional crunchy topping: If you like a crisp top, mix panko with melted butter and a pinch of Old Bay, then sprinkle lightly over the stuffed area.
Air fry: Place the fillets in the basket, leaving space between them. Air fry at 375°F (190°C) for 10–14 minutes, depending on thickness.
The salmon is done when it flakes easily and reaches an internal temperature of 125–130°F for medium or 135–140°F for well-done.
Rest and serve: Let the salmon rest for 2–3 minutes. Serve with lemon wedges and your favorite sides.