Bring a large pot of water to a boil. Add the noodles and cook according to the package instructions.
Drain the noodles and set aside.
In a large skillet, heat the oil over medium heat. Add the onion, bell pepper, mushrooms, carrots, and garlic. Cook until the vegetables are crisp-tender, about 5 minutes.
Add the noodles to the skillet and stir to combine. Add the soy sauce, sesame oil, sugar, and ginger and stir to combine.
Cook for 2 minutes, stirring occasionally, until the noodles are heated through.
Garnish with green onions and serve.
Interesting Facts
Lo Mein noodles were first created during the Qing dynasty (1644–1912).
The name Lo Mein means "tossed noodles" in Chinese.
The noodles are usually made with wheat flour, water, and salt.
The traditional way to eat Lo Mein is with chopsticks.