Cook your noodles according to the packet instructions and once cooked transfer into cold water so that they don't stick to eachother.
Whisk together all your ingredients for the stir-fry sauce in a separate bowl and set aside for later.
Begin by frying off the chopped spring onion (only the white portion) in a large wok on a medium high heat for 2-3 minutes.
Add your chestnut mushrooms and fry for a further 3-4 minutes on the same heat, moving the mushrooms constantly.
Add in the baby pak choi, ¾ of your chopped garlic and continue to stir-fry whilst constantly agitating the pan for 3-4 minutes.
Add in your cooked noodles, bean sprouts, spring onion, stir-fry sauce and remainder of your garlic. Toss or stir for another 3-4 minutes. Be caureful not to break the noodles! As soon as the noodles are coated evenly in the sauce and heated all the way through, enjoy fresh from the pan!