Preheat air fryer to 400° F/200° C.

Decide how you will season your tuna nuggets. I chose fresh dill and small capers because that's what we often use for tuna salad. Other options include substituting dried dill for fresh, or small pieces of apple and chopped nuts, or Old Bay or a similar spice with some chopped vegetables. I highly recommend using something chopped small (minced or diced) to break up the tuna and not just a seasoning like Old Bay.

In a medium bowl, mash the tuna with a fork until it is in small pieces. Add the seasoning and mash again. Add egg by tablespoonfuls until you can mold the mixture but it isn't yet too wet. (This should require about half the egg.)

Mold the tuna nuggets. Then toss them in the remaining egg and coat with the crushed cornflakes. You may have to lightly press the cornflakes onto the nuggets to make sure they adhere.

Gently add the nuggets to the baking tray of the air fryer and bake for about 10 minutes until well-browned and crunchy. You may want to move them around after 7-8 minutes, but that's optional.