Prep the air fryer: Preheat to 390°F (200°C) for 3–5 minutes.
Lightly spray the basket with oil to prevent sticking.
Mix the base: In a medium bowl, combine tuna (well-drained), breadcrumbs, egg, mayonnaise, Dijon, onion, parsley, garlic, Old Bay, pepper, salt, and lemon zest. Stir until just combined.
Adjust texture: The mixture should hold together when pressed. If it’s too wet, add a tablespoon more breadcrumbs.
If it’s too dry, add a teaspoon of mayo or a splash of lemon juice.
Shape the cakes: Form 6–8 small patties, about 1/2 inch thick. Press gently so they’re compact but not smashed.
Oil lightly: Mist the tops with oil spray. This helps them brown and crisp.
Air fry: Arrange patties in a single layer in the basket without crowding.
Cook for 8–10 minutes, flipping at the 5-minute mark and spraying again. They’re done when golden and firm at the edges.
Serve: Squeeze fresh lemon over the tops and add your favorite sauce. Pair with a side salad, slaw, or roasted vegetables.