Boil 6 cups of water in a large pot.
Add diced carrots and celery to the pot.
Stir in the chicken breasts, seasoning with salt, pepper, and thyme.
Simmer for 20 minutes until the chicken is cooked through.
Remove the chicken, shred it, and set aside.
Add egg noodles to the pot and cook for 8-10 minutes.
Return the shredded chicken and add frozen peas.
Stir in fresh parsley before serving.
Adjust seasoning as needed and serve hot.