Heat large pot over medium heat. When pot is warm, add olive oil. Heat oil until hot and shimmering, then add carrots, celery, and onion. Stir and sauté 7 minutes or until vegetables begin to soften.
Once vegetables begin to soften, add minced garlic. Stir to incorporate, then sauté 1 to 2 minutes or until garlic is fragrant.
Add chicken broth, bay leaves, thyme, oregano, and pepper. Stir to incorporate, then increase heat under pot to medium-high and bring liquid to gentle boil. Boil gently 5 minutes or until vegetables are tender. Reduce heat to medium.
Add shredded chicken and lemon juice. Stir well and let mixture simmer 1 to 2 minutes or until chicken is warmed through.
Stir in keto noodles and simmer another 1 to 2 minutes or until noodles are tender.
Remove soup from heat. Ladle soup into serving bowls, garnish with chopped parsley, and serve warm.