1) Heat the oven or air fryer
Oven: Heat to 450°F. Set a wire rack on a sheet pan and lightly oil it.
Air fryer: Preheat to 400°F for 3 minutes. Lightly oil the basket.
2) Season and coat the chicken
In a bowl, whisk together the beaten egg, 2 tablespoons soy sauce, and sesame oil. Pour over the chicken and toss until every piece is evenly coated. This is a quick seasoning and binder, not a long marinade, so 5 minutes is plenty while you prep the coating.
3) Coat for max crunch
In a second bowl, mix cornstarch, panko, baking powder, salt, pepper, and garlic powder. Add chicken and toss until every piece looks thoroughly dressed. Press the coating on a bit with your hands, then give the bowl a little shake and knock off any loose excess. Less excess means fewer gummy spots.

4) Cook until crisp
Oven method (best for big batches): Arrange chicken pieces on the rack with space between them. Spray the tops with oil. Bake 10 minutes, flip, spray again, then bake 5 to 10 minutes more until deeply golden and cooked through. If you are using chicken breast, start checking around the 15-minute mark to keep it juicy. Aim for 165°F for breast. For thighs, 175°F to 185°F gives the best texture.
Air fryer method (crispiest): Place chicken in a single layer (work in batches). In a 6-qt air fryer, this is usually 2 batches. Spray lightly with oil. Air fry 8 minutes, shake and spray again, then air fry 4 to 6 minutes more until crisp and cooked through.
5) Make the sticky sauce
While the chicken cooks, add soy sauce, honey, rice vinegar, water, garlic, ginger, and chili sauce (if using) to a small saucepan. Bring to a simmer over medium heat.
Whisk in the cornstarch slurry and return to a simmer, cooking 1 to 2 minutes until the sauce turns glossy and coats the back of a spoon. Turn off heat.
6) Toss and finish with crunch
Move hot crispy chicken to a large bowl. Drizzle with just enough sauce to coat (start with about half, add more as needed). Toss quickly.
Top with green onions, sesame seeds, and crushed nuts (or your nut-free crunch). Serve immediately over rice or noodles.

7) Optional: hearty bowl build
Do rice, a pile of quick sautéed greens, then the chicken. Spoon a little extra sauce around the bowl like a moat. It is cozy and you deserve it.