In a large bowl, combine the chicken wings with fish sauce, rice vinegar, black pepper, minced garlic, 5-spice powder, ground coriander, lemongrass powder.
Give everything a good mix and place into the fridge to marinate (uncovered) for at least 30 minutes.
Coat the wings:
In a heavy-duty plastic bag, add in cornstarch, potato starch and baking powder. Give the mixture a little shake.
Add in the marinated chicken wings.
Close and seal the bag -- shake to coat the wings thoroughly.
Use a pair of tongs to remove any excess dredge and place the chicken wings onto a lightly greased wire rack on top of baking tray lined with parchment paper.
Bake the chicken wings at 425°F/218°C for 25-30 minutes, or until the internal temperature reaches 165°F/74°C.
Remove from oven.
Combine the seasoning:
In a large bowl, add in minced garlic, salt, pepper, chili, cilantro and green onion.
Add the crispy chicken wings to the seasoning and lightly toss while still warm.
Transfer to a plate and serve immediately.
Notes
Depending on how large your chicken wings are, you may need a longer baking time.