Begin by cubing the chicken breast into bite-sized pieces and placing them in a large mixing bowl. Add baking soda, salt, fresh orange juice, soy sauce, ground black pepper, cornstarch, minced garlic, and ginger. Toss until the chicken is evenly coated. Let it marinate for at least 10 minutes.

In a separate medium-sized bowl, whisk together fresh orange juice, soy sauce, rice vinegar, chili garlic sauce (if using), cornstarch, orange zest, minced garlic, ginger, red chili flakes, brown sugar, and a pinch of salt. Mix until everything is well combined.

Heat a large skillet over medium heat and add a tablespoon of oil. Once shimmering, add the marinated chicken pieces. Sauté for 4-5 minutes, turning occasionally, until golden brown and cooked through.

Pour the prepared sauce over the sautéed chicken, stirring gently to combine. Allow to simmer uncovered for about 5 minutes until the sauce thickens.

Once thickened, remove from heat and sprinkle sesame seeds and chopped green onions over the chicken. Serve hot with cooked rice and steamed broccoli.