Cut the onion and the red and green bell peppers into big bite-sized chunks and set them to the side.
For the sauce, combine the light soy sauce, black vinegar, hoisin sauce, sugar, sesame oil, and water, and mix until the sugar dissolves.
Boil the noodles until one minute short of al dente, then drain and set them aside.
Heat a pan over medium-high heat with a bit of oil. Add the cubed chicken thighs and cook just until they're white all the way through, then pull them out of the pan.
In the same pan, add the sliced garlic, sliced ginger, onions, and dried red chilies, and cook until the onions turn translucent. Add both peppers and cook until they just start to soften.
Add the chicken back in along with the sauce and the peanuts, and let everything bubble away until the sauce is thick and glossy.
Add the noodles and toss until every strand is coated.
Place your noodles in a bowl, or eat it straight out of the pan. It's your food, you eat it how you like.