Soak glass rice noodles in hot water for 5 minutes; drain and cut coarsely.
Boil prawns in salted water for 3 minutes until cooked; drain.
In a bowl, whisk lime juice, fish sauce, chopped green chilies, garlic paste, and sugar into a dressing.
Toss cooked noodles, prawns, and dressing together in a bowl.
Garnish with fresh coriander leaves and serve fresh.