Gather the ingredients. Measure all the sauces, and then set them aside.
Pour 2 tablespoons of cooking oil into the wok on medium-high, and cook the green onion, onion, ginger, and garlic for about 2 minutes, remember to stir frequently until fragrant.
Pour the chicken breast pieces in and stir until the chicken is no longer pink and cooked thoroughly.
Add oyster sauce, light soy sauce, chicken broth, dark soy sauce, fish sauce, cornstarch slurry, and brown sugar into the chicken. Let it simmer for 1 minute so or until the sauce thickens.
Lastly, fold in the basil leaves in. Let the wok simmer for 2 minutes or until the Thai basil leaves are wilted.
Garnish with fresh red chili slices on the top of the dish.
Serve with steamed white rice immediately. Enjoy!