Air Fryer Crispy Pork Belly

Rinse the pork belly and pat it dry with paper towels. Make shallow diagonal cuts on the skin side then rotate the meat at a slight angle and make shallow diagonal cuts again (to look like criss cross). Repeat the same cuts on the meat side. Be careful not to pierce through the meat.
Mix salt, white pepper, Chinese five-spice powder, garlic powder. Add shaoxing wine on the meat side of the pork belly then rub the spice mix all over. On the skin side, lightly brush with vinegar.
Preheat your air fryer to 225F for 5 minutes. Place pork belly on two layers of aluminum foil then fold edges to wrap pork belly tightly on all corners, like a tight boat. Add salt on top of the pork belly skin side up evenly to create a layer of salt. Place the pork belly skin-side up in the air fryer basket. Cook at 225°F for 35 minutes. Check halfway through and drain any excess fat if needed.
Scrap salt off from the pork belly skin then brush with some neutral oil. Increase the temperature to 400°F and cook for an additional 30-35 minutes until the skin is golden, bubbly, and crispy.
If you don't have an air fryer, see notes below for cooking this in the oven.
Remove the pork belly from the air fryer and let it rest for 5-10 minutes. Slice into bite-sized pieces and serve with your favorite dipping sauces or rice.