Heat olive oil in a large pot.
Add chicken slices and cook lightly.
Remove chicken and set aside briefly.
Add onion, ginger, and garlic next.
Cook until fragrant and softened.
Stir in carrots and celery gently.
Pour in chicken broth slowly.
Bring soup to a gentle boil.
Add noodles and cook until tender.
Return chicken to the pot.
Season with salt and pepper.
Add soy sauce and sesame oil.
Simmer five minutes gently.
Garnish with green onions before serving.