Marinate the chicken in buttermilk for at least 30 minutes.
In a shallow bowl, combine the all-purpose flour, paprika, garlic powder, onion powder, salt, and black pepper.
Dredge the marinated chicken in the seasoned flour mixture, making sure to coat it evenly.
Preheat the air fryer to 400°F (200°C).
Spray the air fryer basket with vegetable oil and arrange the coated chicken pieces in a single layer.
Air fry the chicken for 12-15 minutes, flipping halfway, until golden brown and cooked through.
In a saucepan, melt the butter over medium heat.
Whisk in the all-purpose flour and cook for 2-3 minutes, stirring constantly, to make a roux.
Gradually whisk in the chicken broth and milk, and season with salt and black pepper.
Bring the gravy to a simmer and cook, stirring occasionally, until thickened to your desired consistency.
Serve the air-fried chicken with the homemade gravy.
