Line a baking sheet with parchment paper and set aside.
If you’re using chicken breasts, slice them into about 1 1/2″ wide strips.
In a medium bowl blend buttermilk, salt, pepper, paprika and garlic powder. Add chicken pieces, turning to coat well. Cover and refrigerate at least 30 minutes up to 3-4 hours.
Set up a dredging station in 3 bowls: flour in one, beaten eggs in the second bowl and panko in the third. Remove tenders from the marinade one at a time shaking any excess. Working one piece at a time, dredge chicken in flour, shaking off excess then dip in egg and last in panko.
Transfer to the parchment paper lined baking sheet, gently pressing the breading down on the top of each one. Repeat until all the chicken is coated.
Preheat the air fryer to 400° then spray the tenders with cooking spray and add a light sprinkle of salt.
Add chicken pieces to the air fryer basket oiled side down in a single layer.
Spray the opposite side then cook 10-12 minutes total or until they reach an internal temperature of 165° turning them over halfway through.
If they don’t all fit without overcrowding, air fry in batches then when all chicken is cooked, return finished tenders to the air fryer and heat 1-2 minutes at 350°.