Follow these straightforward steps to create your Chicken and Green Bean Stir-Fry:

1. Marinate Chicken: In a bowl, combine the chicken pieces with the soy sauce, cornstarch, rice vinegar, and brown sugar. Let it marinate for about 10 minutes while you prepare the other ingredients.

2. Heat Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until it shimmers.

3. Cook Chicken: Add the marinated chicken to the pan and stir-fry for 5-7 minutes until browned and cooked through. Remove the chicken from the skillet and set aside.

4. Cook Green Beans: In the same skillet, add the green beans. Stir-fry for 3-4 minutes until they are bright green and tender-crisp.

5. Add Garlic and Ginger: Stir in the minced garlic and ginger, cooking for an additional 30 seconds until fragrant.

6. Combine Ingredients: Return the cooked chicken to the skillet with the green beans. Stir to combine all the ingredients evenly.

7. Add Sauce: Pour in the sesame oil and a pinch of salt and pepper, mixing everything until well coated in the sauce. Cook for another minute to heat through.

8. Serve: Immediately serve the stir-fry over cooked rice or noodles. Garnish with sesame seeds if desired.

These simple steps will help you achieve a delicious Chicken and Green Bean Stir-Fry that is sure to impress!