In the meantime, bring a large saucepan of salted water to the boil. Add about 6-8 wontons at a time (work in batches). Cook for another 20secs when they float to the top, until skin is translucent.
Remove with a slotted spoon. Divide among four deep soup bowls.
In the same pan (top up water if needed and bring to boil again), add noodles and cook according to packet instructions until al dente, about 2 mins. Drain, then place directly into the bowls with wontons.
Add broccolini to broth just before you are ready to serve. Let it cook for 1–2 mins, until just tender.
Ladle the broth and broccolini over the noodles and wontons, and top with shallot, coriander and chilli, if using.