In a medium-size bowl combine all the ingredients under the 'to marinate chicken' section and mix it thoroughly before letting it sit for at least 10 minutes.
In a separate bowl combine orange juice, soy sauce, vinegar, chili garlic sauce, cornstarch, orange zest, garlic, ginger, red chili flakes, brown sugar, and salt; whisk until sugar dissolves.
Heat a wide skillet over medium flame; add oil and once heated add marinated chicken pieces cooking for about 4-5 minutes on one side before flipping them over.
After ensuring chicken is cooked through (about 5-6 more minutes), stir in prepared sauce mixture; allow everything to simmer uncovered so flavors meld together.
As sauce starts thickening after about five minutes of cooking along with chicken, toss in sesame seeds and green onions just before serving.
Serve your flavorful Healthy Orange Chicken alongside steaming rice and vibrant steamed broccoli for a complete meal.