Heat the oil in a large saucepan over medium heat.
Add the ginger, garlic and the white parts of the spring onions. Cook for 1–2 minutes until fragrant, not browned.
Add the corn and cook for 3–4 minutes, stirring occasionally, letting some of it catch slightly on the base of the pan.
Pour in the chicken stock. Add the soy sauce, mirin and white pepper. Stir to combine.
Bring to a gentle simmer and cook for 15 minutes.
Blend about 1 to 1½ cups of the soup, then return it to the pot and stir through.
Reduce heat to low. Slowly drizzle in the beaten egg while stirring gently in one direction to create soft ribbons.
Add the shredded chicken and stir until heated through.
Remove from heat. Stir in the sesame oil.
Ladle into bowls and finish with the green parts of the spring onions and sliced chilli.