Prep the cod: Pat the cod pieces dry with paper towels.
This helps the coating stick and gives you better browning.
Set up your dredging station: In one shallow bowl, add flour. In a second bowl, whisk eggs and Dijon. In a third bowl, mix panko, plain breadcrumbs, garlic powder, onion powder, paprika, lemon zest, salt, and pepper.
Coat the nuggets: Working a few pieces at a time, dredge cod in flour (shake off excess), dip in egg, then press into the breadcrumb mixture so it sticks on all sides.
Preheat the air fryer: Set to 400°F (200°C) and let it run for 3 minutes.
A hot basket helps crisp the coating.
Oil lightly: Spray the air fryer basket with cooking spray. Arrange the nuggets in a single layer with space between. Lightly mist the tops with spray or brush with a little oil.
Air fry, flip, finish: Cook at 400°F (200°C) for 8 minutes.
Flip the nuggets, spray again, and cook 4–6 more minutes, until the coating is golden and the fish flakes easily. Internal temp should reach 145°F (63°C).
Season and serve: Sprinkle with a pinch of salt while hot. Add a squeeze of lemon and serve with your favorite dip.
Cook in batches if needed: If your basket is small, don’t crowd it.
Keep cooked nuggets warm in a low oven (200°F/95°C) while finishing the rest.