Method
Cook the noodles following packet directions in the microwave. Drain well. Set aside.
Combine cornflour, soy sauce, and beef stock in a small bowl. Mix well to combine.
Heat a wok or large frying pan over high heat.
Add the oil, swirling to coat the pan.
Add mince and stir fry for 3-5 minutes or until browned.
Transfer to a heatproof bowl.
Stir-fry bok-choy in wok for 3 minutes or until leaves are starting to wilt (add a splash of water if you find bok-choy is sticking or starting to burn).
Transfer bok-choy to a bowl.
Add the onion to the wok and stir-fry for 3 to 5 minutes or until just starting to soften.