Preheat the air fryer: Set to 400°F (200°C) for 3 to 5 minutes. A hot basket helps the nuggets crisp up.
Mix the base: In a bowl, combine drained tuna, egg, breadcrumbs, mayonnaise, Dijon, garlic powder, onion powder, paprika, salt, pepper, parsley, and lemon zest if using.
Stir until the mixture holds together when pressed. If it’s too wet, add a bit more breadcrumbs. If too dry, add a teaspoon of mayo or a splash of water.
Shape the nuggets: Scoop about 1 tablespoon of mixture and press into small ovals or bite-sized patties.
Aim for 1/2-inch thick for even cooking.
Optional crunch step: Roll each nugget lightly in extra panko for a crispier exterior. Press gently so the crumbs stick.
Oil and arrange: Spray the air fryer basket lightly with oil. Place nuggets in a single layer without crowding.
Spray the tops of the nuggets as well. Work in batches if needed.
Air fry: Cook at 400°F (200°C) for 8 to 10 minutes, flipping halfway through. They’re done when golden and crispy with slightly browned edges.
Add 1 to 2 minutes if you like them extra crunchy.
Season and serve: Sprinkle with a pinch of salt right out of the fryer. Serve hot with lemon wedges and your favorite dip.