I love this dish, it's deceptively simple. If you have all the ingredients you can have a plate of delicious noodles on the table within 15 to 20 minutes with prep included. There really isn't such thing as a "Lo Mein" noodle so don't try to find it on the shelf. You want to buy an egg noodle or pasta that's relatively thin and has some tooth. Some common names will be Lo Mein, Chow Mein, egg noodles, or pancit noodles. Most markets have Japanese Yaki Soba noodles in the cold case and those would work perfectly. Cooking spaghetti or fettuccine al dente, cold water rinsing, then allowing to dry in a colander will also make a great lo Mein. The traditional difference between Lo Mein and Chow Mein is Lo Mein is a soft noodle with some gravy and chow Mein is a crispy fried noodle tossed with or smothered in sauce. This has become very convoluted and over the 200 years Chinese food has existed in America and with regional evolutions. Another tip: Although sesame oil is a fat and you would assume it should be used to start the stir-fry, I want you to treat it like a sauce. Sesame oil has incredible aroma and flavor but burns at a low temp. Add it to a sauce instead and use a high temp oil like canola or peanut for cooking.
For the sauce: Stir together the chicken stock, oyster sauce, soy sauce, cornstarch and sesame oil. Set aside.
For the noodles: Heat a pan to high and add the oil. Once you see wisps of white smoke, add the ginger and garlic and cook until light brown and fragrant, about 20 seconds. Stir in the chicken and cook until medium, about 1 minute.
Add the noodles, carrots and bok choy to the pan and cook until tender, about 1 minute.
Stir the sauce, pour into the pan and incorporate all ingredients well.
Continue to cook until the chicken is cooked through and the sauce starts to bubble and thicken. Transfer to a serving platter, garnish with the scallions and serve immediately.