Wash & trim the green beans. Then, in a medium bowl, whisk together the egg & egg white.
Place a few green beans in the egg wash, making sure to coat them well. Use a fork to lift them out, shaking off any excess egg, then place them in the panko. Mix until the beans are very well-coated.
Lay the breaded green beans in a single layer in the air fryer, leaving some space to let the air circulate. Cook for 4 - 5 mins!