Heat a generous drizzle of oil in a medium frypan over medium-high heat. Cook the dumplings, without turning, for 2-3 mins until golden on one side. Carefully add 60ml (¼ cup) water (take care adding water to the hot pan as the oil can spit and the steam created is very hot). Cover and steam for 3 mins or until tender.
Step 2 — Make sauce
While the dumplings are cooking, bring a medium saucepan of water to the boil for the noodles (speed things up by using a kettle to boil the water). Put the oyster sauce, 1 tbs water, 2 tsp soy sauce and 1 tsp white vinegar in a bowl. Add ¼ tsp chilli flakes* and stir to combine (you can omit the chilli if zero heat is preferred).
Step 3 — Cook noodles
Cook the noodles in the pan of boiling water for 2 mins or until tender. Drain, then rinse under hot water to prevent the noodles from sticking.
Step 4 — Stir-fry vegetables
Meanwhile, heat the sesame oil in a large deep frypan over high heat. Stir-fry the vegetable mix for 2-3 mins until slightly softened.
Step 5 — Add noodles and sauce
Add the noodles and sauce to the vegetables. Toss, over high heat, for 1 min or until the sauce is slightly thickened. Thinly slice the spring onion (to speed up the prep, cut the spring onion into shorter lengths and line up on a board, then cut through all the pieces at once).
Step 6 — Get ready to serve
Divide the noodle stir-fry and dumplings among bowls. Scatter with the spring onion to serve.