Add the sesame oil down the sides of a hot Wok. Keep on a high heat.
Add your roughly chopped mushrooms and stir fry until they start to brown (around 5 miuntes). Keep them moving in the pan for best results.
Add the spring onion and continue cooking for another 2-3 minutes.
Now add the cooked noodles to the wok, along with the Chow Mein sauce. Toss together in the pan until well combined.
Serve immediately. Sprinkle the leftover sesame seeds on top.