Cook the Lo Mein noodles according to package instructions. Rinse with cold water after cooking, drain and set aside.
Marinate the chicken with cornstarch and set aside.
Prepare the Sauce in a small bowl. Stir to mix well. Set aside.
Heat up a skillet on high heat. Add the oil. Sauté the garlic, then add the chicken and stir-fry until the surface turns white.
Add the bok choy, mushroom, and carrot, stir to combine well.
Add the Sauce into the skillet, stir to mix with the ingredients.
Transfer the Lo Mein into the skillet, stir to coat well with the sauce and combine well with the ingredients.
Dish out and serve immediately.