In a mixing bowl, combine orange juice, soy sauce, honey, minced garlic, grated ginger, and rice vinegar. Whisk until well blended.
In a separate bowl, mix cornstarch and water to create a slurry.
Heat vegetable oil in a large skillet or wok over medium-high heat.
Add chicken pieces to the skillet and cook until golden brown and cooked through, about 5-7 minutes per side.
Once the chicken is cooked, pour the orange sauce over it, stirring gently to coat evenly.
Allow the sauce to simmer and thicken for 2-3 minutes.
Stir in the cornstarch slurry to further thicken the sauce if desired.
Remove from heat and garnish with sesame seeds and chopped green onions, if desired.
Serve hot with steamed rice or vegetables.