Empty the pot of green Thai chicken soup into a large saucepan. Half-fill the empty soup pot with water, swish around to wash out all the soup, and add to the pan.
Bring to a simmer, then add the rice noodles, sugar snap peas and beansprouts. Cook for 1-2 mins until the noodles are cooked but the peas are still crunchy.
Ladle into deep bowls and scatter with coriander leaves, if you like.