Cut chicken breast into thin stripes.Boil them for about 5-10 minutes.
Mix together the vinegar, soya sauce, sugar, salt, and cornflour and add enough water. Keep aside.
Heat the oil, add onions and garlic.
Saute till a little soft. Add the carrots, cabbage, and capsicum, stir-fry over high heat for a minute.
Add the water mixture, and chicken. Stir it continuously.
Add boiled noodles, mix well and cook for another 3-4 minutes. Serve the Chicken Noodles and enjoy.