Combine five spice powder, onion powder, garlic powder, chili powder, white pepper, salt, and soy sauce in a bowl. Toss to mix dry ingredients.
Marinade chicken thighs in spice mix and let sit for 30 minutes.
Pre-heat air fryer for 7 minutes at 400 °F.
While air fryer is pre-heating, mix potato starch and corn starch. Lightly dredge thigh pieces with starch mix.
Spray the basket with a neutral oil. Place thighs into air fryer and ensure there is space between each piece. Spray the top of the chicken lightly. Cook at 400 °F for 7 minutes.
After 7 minutes, turn each piece over and cook for another 7 minutes. Total cooking time should be 12 minutes. Remove from air fryer and set aside.
Repeat steps 6-7 if air frying in batches.
In your last batch, add the Thai basil leaves for the last 4-5 minutes. Spray with oil so the leaves crisp up with the chicken.