01 - Heat olive oil in a large pot over medium heat. Add diced chicken, season with salt and pepper, and sauté until lightly browned, about 4 minutes. Remove chicken and set aside.
02 - Add onion, carrots, and celery to the pot. Cook, stirring occasionally, until vegetables begin to soften, approximately 5 minutes. Add garlic and cook for 1 minute more.
03 - Return chicken to the pot. Pour in chicken broth, add green beans, bay leaf, and thyme. Bring mixture to a boil.
04 - Reduce heat to low, cover, and simmer for 15 minutes to meld flavors.
05 - Stir in egg noodles, corn, and peas. Continue simmering uncovered for 8 to 10 minutes, or until noodles and vegetables are tender.
06 - Remove bay leaf. Stir in chopped parsley and adjust seasoning with salt and pepper to taste.
07 - Ladle soup into bowls, garnish with additional parsley if desired, and serve hot.