Easy chicken stir fry with bell peppers - *Quick recipe*

This chicken stir fry recipe with bell peppers is a must try for everyone and easy to prepare of course. see recipe below: CHICKEN STIR FRY with bell peppers - 250 grams boneless chicken breast/ thighs - 1 red bell pepper - 1 green bell pepper - 1 yellow bell pepper - 1 large onion - 3 tablespoons vegetable oil for stir frying for the marinade sauce - 1 tablespoon water - 2 tablespoons soy sauce - 1 teaspoon wine vinegar or lemon juice - 1 teaspoon vegetable oil - 1 teaspoon corn starch stir fry sauce - 1/4 cup chicken stock - 2 tablespoons soy sauce - 1 teaspoon wine vinegar or lemon juice