Season the chicken pieces with salt and pepper.
Heat a large wok or skillet over medium heat and cook the chicken until fully cooked, about 6–8 minutes; transfer to a bowl and set aside.
In a small bowl, whisk together the soy sauce, tamarind paste, honey, minced garlic, lime juice, and crushed red pepper flakes to make the sauce.
In the same wok, add the eggs and scramble for about 1 minute until just set.
Add the sliced yellow onion and bean sprouts to the wok and cook until the onion is translucent, about 2–3 minutes.
Return the cooked chicken to the wok, pour in the sauce, then add the cooked or soaked rice noodles; toss everything together until the noodles are evenly coated and heated through, about 2–3 minutes.
Stir in the sliced green onions and chopped cilantro just before serving.