In a stock pot or heavy bottom sauce pan add olive oil and heat to medium high heat. Add chopped celery, bell pepper, onion and carrots. Sauté until veggies are tender and add minced garlic, cook and stir for 1 minute.
Reduce heat to low and add thyme and parsley, and black pepper. Stir and cook for about 1 minute.
Add the chicken broth and leftover chicken. Turn heat up and heat to boil.
Add pasta to boiling pot and cook for 12 minutes until pasta is soft.
Serve this leftover chicken soup topped with green onions or additional herbs.