Bring a pan of salted water to the boil and cook the noodles according to package instructions. Drain and set aside. Add some oil to prevent sticking.
Place a wok on high heat and add some oil. Add the beef mince and stir fry for 10 minutes or until the mince it crispy and browned. Once the beef is done remove any excess fat from the pan. Add the garlic, chili pepper and fry for a bit too. Add the soy sauce and the chili sauce and mix it all together.
Remove from the pan and use the leftover oil to stir fry the bok choy until cooked and wilted. Add the beef back in and mix it together.
Add the noodles and give it a good shake. Once done divide over two bowls and serve with the spring onion and sesame seeds.