Prepare the Chicken: Season the chicken pieces with salt and black pepper.
Cook the Chicken: In a large skillet, heat the vegetable oil over medium-high heat. Add the chicken pieces and cook for about 5-7 minutes, or until they are golden brown and cooked through. Remove the chicken from the skillet and set aside.
Add Honey and Soy Sauce: Stir in the honey, soy sauce, and rice vinegar. Bring the mixture to a simmer.
Thicken the Sauce (optional): If you prefer a thicker sauce, mix the cornstarch with water in a small bowl to create a slurry. Slowly stir the slurry into the sauce and cook for another minute until it thickens.
Combine Chicken and Sauce: Return the cooked chicken to the skillet, tossing it in the sauce until evenly coated and heated through.
Garnish and Serve: Remove from heat and garnish with chopped green onions and sesame seeds if desired. Serve warm over rice or with vegetables.