Peel the boiled eggs, and use your hands to wrap the sausage meat around them in a thin, even layer. Make sure that none of the eggs are exposed.
Add breadcrumbs, flour and a cracked raw egg into three separate bowls. Use a small whisk or a fork to whisk the egg together.
Dip one of the sausage balls into the bowl of flour, and roll it around until the surface is completely covered in flour.
Then, place the sausage ball into the bowl with the whisked egg. Use a fork to roll the ball around until it's completely covered in a thin layer of egg. Shake off the excess egg as you lift it out of the bowl.
Finally, transfer the ball to the bowl with breadcrumbs, and roll it around to cover it completely. Place the scotch egg on a plate.
Repeat steps 3-5 until all of the scotch eggs are covered in flour, egg, and breadcrumbs.
Preheat your air fryer to 400 F / 200 C. Optionally, brush or spray some cooking oil on the sides to prevent the eggs from sticking to it. This is not necessary if you have a non-stick air frying basket.
Place scotch eggs in the air fryer basket. Make sure to leave some space between each egg; you might have to cook them in two batches. Air fry for about 12 minutes, turning the eggs once halfway through cooking.