Preheat the air fryer. Set it to 390°F (200°C) so it’s hot and ready when the tuna bites go in.
Drain the tuna thoroughly. Press out excess liquid with the lid or a fork. Too much moisture makes soggy bites.
Mix the base. In a bowl, combine tuna, egg, breadcrumbs, mayonnaise, Dijon, onion, parsley, garlic, lemon zest, paprika, salt, and pepper.
Stir until the mixture holds together when pressed. If it feels wet, add a tablespoon or two more breadcrumbs.
Shape the bites. Scoop about 1 tablespoon per bite and roll or press into small nuggets or mini patties. Aim for uniform size so they cook evenly.
Prep the basket. Lightly spray the air fryer basket with oil to prevent sticking.
You can line with perforated parchment made for air fryers if you prefer.
Air fry in batches. Place the bites in a single layer with a little space between them. Spray the tops lightly with oil. Cook for 8–10 minutes, flipping halfway, until golden and crisp at the edges.
Taste and adjust. Try one and add a pinch of salt or a squeeze of lemon to the rest if needed.
Keep warm while you finish the batch.
Serve. Plate with lemon wedges and a dip of choice. They’re excellent over greens, tucked in a pita, or served as party bites.