Start by cutting the boneless, skinless chicken breasts into bite-sized pieces. It's important to ensure they are relatively uniform in size to ensure even cooking. Once cut, set the chicken aside.
Step 2: Make the Teriyaki Sauce
In a small bowl, whisk together the soy sauce, mirin, hoisin sauce, brown sugar, minced garlic, and grated ginger. This combination of ingredients will create the flavorful teriyaki sauce that will coat the chicken. Set the sauce aside.
Step 3: Cook the Chicken
Heat the vegetable oil in a large skillet or wok over medium-high heat. Once the oil is hot, add the chicken pieces and cook until they are browned on all sides and cooked through. This typically takes about 6-8 minutes. Make sure to stir occasionally to prevent sticking.
Step 4: Add the Teriyaki Sauce
Once the chicken is cooked, pour the teriyaki sauce over the chicken in the skillet. Stir well to coat the chicken evenly with the sauce. Continue cooking for an additional 2-3 minutes to allow the flavors to meld together.
Step 5: Thicken the Sauce
In a separate bowl, whisk together the cornstarch and water until the cornstarch is fully dissolved. Pour this mixture into the skillet with the chicken and sauce. Stir well to combine. The cornstarch will thicken the sauce, giving it a glossy appearance.
Step 6: Garnish and Serve
Once the sauce has thickened, remove the skillet from heat. Transfer the Chinese Teriyaki Chicken to a serving dish and garnish with sesame seeds and sliced green onions for added flavor and visual appeal. Serve the dish hot and enjoy!