Marinate the chicken: Add the dark soy sauce, light soy sauce, fish sauce, garlic, lemongrass and sugar to a bowl and mix to combine. Add the chicken and coat well. Marinate for at least 15 minutes, or longer if you have time.
Cook the chicken: Preheat your air fryer to 200°C. Air fry the chicken for around 15 minutes, or until cooked through and nicely caramelised. Cooking time may vary depending on the size of your thighs.
Make the sauce: While the chicken cooks, mix all the sauce ingredients together. Taste and adjust with extra lime, fish sauce or sugar if needed.
Cook the noodles: Cook the rice noodles according to the packet instructions. Rinse under cold water, then drain well.
Slice: Let the chicken rest briefly, then slice into strips.
Assemble: Add the noodles to a bowl, top with the chicken, cucumber, carrot and coriander. Drizzle generously with the sauce and finish with crushed peanuts if desired.
