My daughter taught me this trick today. Once she had them done, she and her kid were going to create colored eggs for Easter.
A project, she called it.
Air fryer, 250 degrees. 15 minutes minimum. Maybe even 17 or 19 or 21 minutes.
The only way to know if they are done is to peel and examine one unpeeled. Once you are certain, then cool them in cool water.
I volunteered to test the first egg. It started to peel nicely, then there was a small area that was wet. The white had stopped hardening in one spot.
We pondered putting them back in the air fryer. We had to wait for the second batch to finish, and we added time to the batch just to be more certain.
Meanwhile, we put the first peeled egg in the microwave to firm up that last bit of white.
I don't know how many seconds she put it in for, but within seconds it sounded like someone had been shot.
The egg had exploded. All over the microwave.
The second egg peeled a bit better, the egg fully cooked.
One thing, the yolks are yellow. Not greenish. She did good cooling them down.
No dry icky yolks. They are moist and flavorful.