Step 1: Prepare Teriyaki Sauce: In a small bowl, whisk together soy sauce, mirin, brown sugar, rice vinegar, sesame oil, cornstarch, and water. Set aside.
Step 2: Cook Chicken: 2. Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat. 3. Add chicken pieces and stir-fry until lightly browned and cooked through, about 5–6 minutes. Remove chicken and set aside.
Step 3: Stir-Fry Vegetables: 4. In the same skillet, add remaining 1 tablespoon of oil. 5. Add garlic and ginger, sauté 30 seconds until fragrant. 6. Add broccoli and bell peppers. Stir-fry for 4–5 minutes until vegetables are crisp-tender.
Step 4: Combine Chicken and Sauce: 7. Return chicken to the skillet. 8. Pour in the prepared teriyaki sauce and stir to coat chicken and vegetables evenly. 9. Cook for 2–3 minutes, allowing sauce to thicken and glaze the chicken and vegetables.
Step 5: Serve: 10. Serve stir-fry over cooked rice. 11. Garnish with sesame seeds and sliced green onions.