Heat the olive oil in a medium pot over medium heat.
Add the diced yellow onion, sliced carrots, and sliced celery to the pot.
Sauté the vegetables for 5-7 minutes until they are tender and the onions are translucent.
Place the chicken breast into the pot and lightly brown for 2 minutes per side.
Pour in the chicken bone broth and add the dried thyme.
Bring the liquid to a gentle simmer, cover, and cook for 12-15 minutes or until the chicken is cooked through.
Remove the chicken from the pot, shred it with two forks, and return the meat to the broth.
Add the whole wheat egg noodles and simmer for 6-8 minutes until the noodles are al dente.
Turn off the heat and stir in the sea salt, black pepper, and plain Greek yogurt until the soup is creamy.
Garnish with fresh parsley and serve immediately.