Start by cutting the chicken breast into strips. This allows for quick cooking and easy eating.
In a small bowl, combine the cornstarch, granulated sugar, soy sauce, and toasted sesame oil. Stir until smooth and set aside.
In a wok or large skillet, heat the tablespoon of cooking oil over medium-high heat.
Add the chicken strips to the hot oil, cooking them for about 4-5 minutes until they are golden brown and cooked through. Remove the chicken from the pan and set it aside.
In the same pan, add the chopped onion and sauté for 2-3 minutes until translucent. Add the minced garlic, green beans, and red bell pepper, cooking for an additional 4-5 minutes until the vegetables are tender yet still crisp.
Return the cooked chicken to the pan with the vegetables. Pour the sauce mixture over everything, followed by 1/4 cup of water. Stir well to coat all the ingredients and allow it to simmer for 2-3 minutes until the sauce has thickened slightly.
Taste your dish and add salt as needed. If you prefer a bit more sauce, feel free to add the remaining 1/4 cup of water and let it simmer a bit longer.
Serve your Panda Express-Inspired String Bean Chicken hot over a bed of white steamed rice. Dig in and enjoy the burst of flavors!