Lightly season chicken pieces with salt and pepper.
Heat oil in a large skillet over medium-high heat. Sauté chicken for 6–8 minutes until golden and cooked through. Remove and set aside.
In the same skillet, combine soy sauce, water, brown sugar, honey, vinegar, garlic, and ginger. Bring to a simmer over medium heat.
Stir in the cornstarch slurry and cook 1–2 minutes until the sauce thickens.
Return chicken to the pan and toss to coat with the teriyaki glaze. Simmer another 2 minutes until sticky and glossy.
Garnish with sesame seeds and green onions. Serve with steamed rice or stir-fried vegetables.