In a large pot, heat olive oil over medium heat.
Add onion, carrots, and celery. Sauté until softened, about 5 minutes.
Stir in garlic and cook for another minute.
Pour in chicken broth and bring to a boil.
Reduce heat and add shredded chicken, cooked rice, thyme, and parsley.
Simmer for 10-15 minutes, stirring occasionally.
Season with salt, pepper, and a squeeze of lemon juice if desired.
Serve hot and enjoy!