Cook pasta in salted boiling water according to packet instructions, drain (reserve half a cup of pasta water) and keep aside.
Meanwhile, heat oil in a large frying pan on medium. Add garlic and sauté for 30 seconds. Add prawns and cook, tossing, for 2-3 minutes, until they change colour. Then add the dried herbs, chilli flakes and sweet chilli sauce; continue to cook till the prawns are almost done.
Add the snow peas and cook for another minute (dont overcook the snow peas)
Add the pasta to the pan, season with salt and toss to combine. Add some of the reserved pasta water if it feels too dry.
Serve warm with a pinch of chilli flakes and a drizzle of olive oil on top.