Take the turkey breast out of its packing and pat it dry. If it has a netting leave it on.
3-5 pound bone in or boneless turkey breast
Spread the oil over the turkey skin and then sprinkle on the herbes de Provence, coating all sides of the turkey breast. Sprinkle the salt and black pepper as well, if desired.
1 Tablespoon olive oil, 1/2 Tablespoon herbes de Provence seasoning or poultry seasoning, 1 teaspoon kosher salt, 1 teaspoon black pepper
Put the turkey breast in the air fryer basket and set it at 350 degrees F for 20 minutes. It doesn't matter which side goes down.
When the air fryer is finished use tongs to flip it over and cook it at 350 F for another 30 minutes.
Check the internal temperature of the turkey with an instant read thermometer. The turkey is done when it reaches 145 degrees F internal temp. If you have a boneless breast check the temperature in the middle. If it is a bone in breast check the temperature near the bone, but not touching the bone.
If the turkey needs extra time put it back in the air fryer at 350 degrees F and check the temperature again every 5-10 minutes.
Once the turkey is done take it out and let it rest on a serving platter, covered with foil, for 15 minutes before cutting.
Notes
In my air fryer a boneless turkey breast has 60 minutes total cook time and a bone in one was done slightly more quickly in 50 minutes. But air fryers vary and turkey breast sizes vary, so always check the internal temperature with a thermometer, don't rely on time.