Cook noodles according to pack instructions. Heat the olive oil and 1 tbsp sesame oil in a large wok, then stir fry the chicken until it just changes colour.
Add spring onions and garlic, cook briefly, then add black bean sauce and toss well. Drain noodles, add to the wok with the bean sprouts and remaining sesame oil. Toss until piping hot. Serve with soy sauce.