Prepare the Chicken:
In a bowl, mix cornstarch, flour, baking powder, salt, black pepper, cayenne, and garlic powder.
In a separate bowl, whisk the egg with buttermilk.
Dip the chicken into the buttermilk mixture, then coat evenly in the dry mix.
Cooking Methods:
Deep-Frying: Heat oil to 350°F (175°C). Fry chicken in batches for 5-6 minutes until golden and crispy. Drain on a wire rack.
Air-Frying: Preheat air fryer to 400°F (200°C). Spray chicken with oil and cook for 10 minutes, flipping halfway.
Baking: Preheat oven to 425°F (220°C). Place coated chicken on a wire rack over a baking sheet. Spray with oil and bake for 20-25 minutes.
Make the Sauce:
In a pan over medium heat, combine honey, soy sauce, sweet chilli sauce, garlic, ginger, red pepper flakes, vinegar, sesame oil, and water.
Mix cornstarch with a little water and stir into the sauce to thicken.
Simmer for 2 minutes, stirring constantly.
Combine:
Toss crispy chicken pieces in the sauce until well coated.
Serve immediately, garnished with sesame seeds and chopped green onions.