Start by cutting the chicken breasts into 1-inch pieces. Trim the green beans and mince the garlic and ginger. Having everything ready will make the cooking process seamless.
In a large skillet or wok, heat 1 tablespoon of vegetable oil over medium-high heat. Make sure the oil is hot but not smoking, as this will ensure a nice sear on the chicken.
Add the chicken pieces to the skillet in a single layer. Cook for about 5-7 minutes, or until the chicken is golden brown and cooked through. Stir occasionally to ensure even cooking.
Once the chicken is cooked, add the minced garlic and ginger to the skillet. Stir for about 30 seconds until fragrant—this is where the magic begins!
Add the trimmed green beans and stir-fry for another 3-4 minutes, or until the beans are tender-crisp. You want them to retain their vibrant color and crunch.
In a small bowl, whisk together the low-sodium soy sauce, oyster sauce, rice vinegar, sugar, and the cornstarch mixed with water. Pour this mixture over the chicken and green beans in the skillet.
Stir well to coat everything in the sauce. Cook for an additional 1-2 minutes until the sauce thickens slightly and everything is heated through.
Remove the skillet from heat and serve your Chicken And Green Bean Stir-Fry immediately. Pair it with steamed rice or noodles for a complete meal!