Pat the chicken dry and cut it into even bite-sized pieces.
Toss the chicken with cornstarch, salt, and black pepper until lightly coated.
Heat oil in a large skillet over medium-high heat.
Add the chicken in a single layer and cook for 5–7 minutes, stirring occasionally, until golden and nearly cooked through.
In a small bowl, whisk together soy sauce, honey, garlic, ginger, rice vinegar, sesame oil, and water.
Pour the sauce into the skillet and stir to coat the chicken.
Simmer for 3–5 minutes, stirring often, until the sauce thickens and turns glossy.
Remove from heat and garnish with sesame seeds and green onions if desired.
Serve hot with rice, noodles, or vegetables.
