Soak the rice noodles in hot (not boiling) water for 8 to 10 minutes until pliable but firm; drain.
Whisk together the soy sauce, oyster sauce, brown sugar, rice vinegar, sesame oil and sriracha.
Heat 1 tablespoon of oil in a wok over high heat; cook the chicken 2 to 3 minutes per side until cooked through. Remove to a plate.
Add the remaining oil; fry the bell pepper, carrots and white parts of the green onions for 2 minutes. Add the garlic and ginger and fry 30 seconds more.
Add the drained noodles and sauce; toss for 2 minutes until tender and evenly coated, adding a splash of water if dry.
Return the chicken with the bean sprouts and green onion tops; toss 1 minute more.
Serve immediately, topped with peanuts, lime wedges and extra green onions.