Cut the chicken into 1-inch pieces and pat dry with paper towels.
Set up three shallow bowls: one with cornstarch, one with beaten eggs, and one with sesame seeds, salt, pepper, garlic powder, and onion powder mixed together.
Roll each chicken piece in cornstarch, then dip in egg, and finally roll in the sesame seed mixture, pressing gently for seeds to stick.
**Oven:** Preheat oven to 400°F (200°C). Place chicken on a parchment-lined baking sheet in a single layer. Bake for 20-25 minutes, until cooked through and golden brown.
**Air Fryer:** Preheat air fryer to 375°F (190°C). Place chicken in the air fryer basket in a single layer (cook in batches if needed). Cook for 10-12 minutes, flipping halfway, until cooked through and crispy.
For the sauce (optional): In a small pan, whisk together soy sauce, honey, rice vinegar, sesame oil, and ground ginger. Heat over medium heat, stirring until slightly thickened, about 2-3 minutes.
Serve chicken with sauce poured over or on the side for dipping. Garnish with extra sesame seeds or green onions if desired.