Fill a large pot with water and once the water is boiling, cook your egg noodles according to the package, drain and set aside.
In a separate large pot or Dutch oven, add the oil and heat over medium-high heat to warm. Add the carrots, celery and onion to Dutch oven and sauté for about 7 minutes, or until vegetables begin to soften. Stir intermittently. Add the garlic and sauté for another 1 to 2 minutes.
Add the chicken broth, bay leaves, thyme, oregano, pepper, salt, and bring to a boil. Allow mixture to boil gently for about 5 minutes or until vegetables are fork-tender.
Add the shredded chicken, parsley, lemon juice, if using, and boil for 1 to 2 minutes, or until chicken is warmed through.
Taste soup and add salt to taste. This will vary based on how salty the brand of chicken broth used is, how salty the rotisserie chicken is, and personal preference. Make any necessary seasoning adjustments (i.e. more pepper, herbs, etc.) and remove the bay leaves.
When ready to serve, add about ⅔ cup of cooked noodles into a bowl and scoop soup over the noodles and serve immediately.