Soak the rice noodles in a bowl of warm water for 15 minutes or until soft but not squishy. Drain and set aside.
Combine the fish sauce, lime juice, sugar and chilli flakes in a bowl.
Heat a wok and add the oil and garlic. Stir fry 30 seconds then add the prawns and stir fry until they are cooked, about 3 minutes. Add the noodles and toss until the noodles are coated with oil. Try not to break up the noodles.
Pour in the fish sauce and lime mixture and toss to combine over medium heat until the noodles have absorbed most of the liquid.
Push the noodles to one side in the wok then add a little extra oil. Pour in the beaten eggs. Let them cook until they are setting, then stir through the noodles. Add the spring onions and cook for 2 minutes. Garnish and enjoy!