Pat the turkey breast completely dry with paper towels. Let it sit at room temperature for 20 to 30 minutes before cooking.
In a small bowl, mix together the softened butter, olive oil, smoked paprika, garlic powder, onion powder, dried thyme, dried sage, salt, and black pepper until you have a smooth seasoned butter.
Rub the seasoned butter generously all over the turkey breast, making sure to coat the top, bottom, and sides evenly. Get some underneath the skin if possible for extra flavor.
Preheat the air fryer to 350°F (175°C) for 3 minutes.
Place the turkey breast skin-side down in the air fryer basket. Air fry at 350°F for 20 minutes.
Carefully flip the turkey breast so it is skin-side up. Increase the temperature to 375°F (190°C) and continue air frying for another 20 to 30 minutes, until the internal temperature reaches 165°F (74°C) and the skin is golden and crispy.
Remove the turkey breast and tent it loosely with foil. Let it rest for 15 minutes before slicing. This resting time is essential for juicy, tender slices.