Heat olive oil in a large pot over medium heat.
Add diced onion, sliced carrots, and sliced celery to the pot. Cook, stirring occasionally, until the vegetables are softened, about 5-7 minutes.
Add minced garlic and cook for 1 minute until fragrant.
Pour in the chicken broth and bring the mixture to a boil.
Add the shredded cooked chicken, dried thyme, dried parsley, salt, and black pepper. Stir to combine.
Reduce heat to medium-low and simmer for 10 minutes to allow flavors to meld.
Add the orzo pasta to the soup and cook until tender, about 8-10 minutes, stirring occasionally to prevent sticking.
Remove the pot from heat and stir in the fresh parsley and lemon juice.
Taste and adjust seasoning with additional salt and pepper if needed.
Serve hot and enjoy your comforting chicken noodle soup with orzo.