In a large soup pot, heat oil briefly over medium heat. Add celery, onion, and carrots. Cook for 5 minutes, stirring occasionally to prevent browning.
Add broth, chicken, and dried parsley. Cover and bring soup to a simmer. Simmer for 5 minutes, and then increase heat to bring soup to a boil. Once boiling, add pasta and continue gently boiling (covered) until pasta is done (following time recommendation on pasta package).
Taste and season with salt, as needed, so the flavors pop. (This can vary a bit depending on your brand of chicken broth, but we find approximately ¾ teaspoon typically works well.) Garnish with fresh parsley if desired.
