Combine fish sauce, lime juice, soy sauce, sriracha, and brown sugar in a small bowl and stir to combine.
Soak the dry noodles in water for 10 minutes until soft.
Preheat oil in a large pan over medium high heat (about 2 minutes). Add chicken and garlic and cook for 3 minutes. Add noodles into the pan and stir continuously for 1 minute.
Shift the noodles to one side to make some space in a pan to crack the eggs. Add the eggs and cook until they have thickened and there are no visible liquid parts remaining. Stir into the noodles and continuously mix the ingredients together for one minute.
Add in prepared sauce and continue to stir to combine together. Turn heat down to low and add in tofu, chives and bean sprouts. Continuously stir for another minute.
Sprinkle in chopped peanuts and serve immediately.