Start by splitting the chicken into wings and drummettes by slicing right through the joints and discarding the end flap.
In a colander, thoroughly rinse the wings and drummettes under running cold water and pat them completely dry with paper towels. It's easier if you transfer the dry ones to a separate baking sheet with paper towels underneath.
Once completely dry, transfer them to a medium mixing bowl and add 1 generous tbsp of olive oil. Mix it well by hand or with a spatula. Then add in baking powder, garlic powder, onion powder, paprika, salt & pepper. Give it a nice mix until every wing/drummette is uniformly coated.
Next, spray the air fryer basket with some oil spray and add in the battered chicken wings and drummettes. Close the basket, set the temp to 380 degrees and 16 minutes. (Flipping it once in the middle 8-minute mark). Flip it again, and set to 400 and air fry again for another 4 minutes, until nice and crispy.
While the wings are cooking in the air fryer, let's prepare the sauce. Start by grating a fuji apple using a box grater (you can use a blender if you want) and add it to a saucepan on medium-high heat. Heat it for about 30 seconds while stirring. Then add in the ketchup, soy sauce (may use worcestershire sauce), and oligodang (may use 1 cup sugar). Turn the heat down to medium-low. Continue to cook while stirring for about a minute. Then add in your vinegar and your corn starch slurry (optional) and give it a nice mix for about 30 seconds until nice and thick. Give it a taste and add more sugar or vinegar, if needed.
Take it off the heat and let it cool at room temp until chicken wings come out of the air fryer. Then add the sauce into a large mixing bowl.
Once the chicken wings are cooked, add them into the mixing bowl with the sauce and give it a nice toss. Use a spatula to mix it in thoroughly until fully coated with the sauce.
Plate it up and enjoy! Yummmy!