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 onions , shredded
• 2 tsp soy sauce , plus extra for serving
• mint or basil leaves and a little shredded chilli (optional), to serve