Prepare the Sauce: In a small bowl, whisk together soy sauce, sesame oil, honey, garlic, ginger, and cornstarch (if using). Set aside.
Cook the Chicken: Heat 1 tablespoon avocado oil in a large skillet or wok over medium-high heat. Add the chicken in a single layer and cook for 4–5 minutes, stirring occasionally, until golden and fully cooked. Remove from the pan and set aside.
Add Optional Vegetables: In the same pan, sauté broccoli, snap peas, or bell peppers for 2–3 minutes until tender-crisp.
Combine and Toss: Return the chicken to the pan. Pour the sauce over the chicken and vegetables, stirring gently to coat. Let the sauce simmer for 1–2 minutes until slightly thickened and glossy.
Serve and Enjoy: Serve the sesame chicken over steamed rice, quinoa, or cauliflower rice. Garnish with sesame seeds and chopped green onions for a fresh finish.