Preheat oven to 200ºC (400ºF) or air fryer to 190 Cº (380ºF).
Cut the chicken breast into chunks (4 cm or 1 1/2 inches).
Prepare 3 separate bowls - add flour, salt and spices in the first, beat egg in the second and crush cornflakes in the third.
Coat each chicken chunk first in flour, then egg, then cornflakes, pressing firmly and turning to coat on both sides. Line over a parchment paper covered baking tray.
Spray chicken nuggets with cooking spray or drizzle with olive oil. Bake in hot oven or hot air fryer for 12 to 15 minutes, flipping halfway through.