Drain the noodles, transfer to a bowl, and toss with sesame oil to prevent sticking.
3 Cook the vegetables: Set a wok or large skillet over medium-high heat. Once hot, add olive oil along with the sliced mushrooms, and stir fry for 2-3 minutes until the mushrooms lose their water and start to brown slightly. Then add the red pepper, carrot, and cabbage. Continue to cook for about 3 minutes, stirring regularly until the vegetables are wilted.
4 Add the noodles and sauce: Add noodles along with the sauce and stir with the vegetables to combine. The sauce should coat the noodles and vegetables. If the noodles seem dry, add more water, a tablespoon at a time.
Taste and adjust the flavor to your liking. It might need another dash of soy sauce, for example.
5 Serve: Serve the Veggie Lo Mein topped with scallions, sesame seeds, and wasabi edamame (if you like it hot) for some nice spicy crunch.
Leftovers! You can store leftovers in the fridge for 3-4 days. They will reheat beautifully in the microwave.