Gather your ingredients and have everything organized.
Prepare the vegetables by washing and slicing the carrots and celery, dicing the onion, and mincing the garlic.
Cook the chicken if using raw; otherwise, shred rotisserie chicken.
In a large pot, heat olive oil over medium heat, add onion and sauté for 3-4 minutes until translucent, then add garlic, carrots, and celery, cooking for an additional 5 minutes.
Add thyme, oregano, black pepper, and salt, then pour in chicken broth. Bring to a boil, reduce heat to simmer, and add chicken, green beans, peas, and egg noodles. Let simmer for 15-20 minutes.
Taste and adjust seasoning if necessary, then garnish with fresh parsley before serving.