Step 1

To make the sauce, stir together the oyster sauce, sesame oil, soy sauce, chicken stock and cornstarch in a small bowl and reserve.

Step 2

Heat a wok or large, heavy-bottomed skillet over high heat and add the cooking oil. Once you see wisps of white smoke, add the garlic and ginger and cook, stirring, until light brown and fragrant, about 20 seconds. Add the chicken and cook, stirring, until medium, about 1 minute.

Step 3

Stir in the noodles and bok choy and cook, stirring and tossing, until the bok choy starts to soften and turn bright green, about 1 minute.

Step 4

Stir in the sauce; allow the sauce to coat all the ingredients and start to simmer, about 1 more minute.

Step 5

Cook, stirring and tossing, until the chicken is cooked through, about 1 more minute, and the sauce starts to bubble into a glaze. Top with the scallions and serve hot.