Chicken noodle soup

Name: Chicken noodle soup
Ingredients: 900ml chicken or vegetable stock (or Miso soup mix); 1 boneless, skinless chicken breast, about 175g/6oz; 1 tsp chopped fresh root ginger; 1 garlic clove, finely chopped; 50g rice or wheat noodles; 2 tbsp sweetcorn, canned or frozen; 2-3 mushrooms, thinly sliced; 2 spring onion, shredded; 2 tsp soy sauce, plus extra for serving; mint or basil leaves and a little shredded chilli (optional), to serve