Heat the olive oil in a large pot over medium heat.
Add the diced yellow onion, carrots, and celery to the pot, sautéing until the onions are translucent and fragrant.
Stir in the minced garlic, dried thyme, sea salt, and black pepper, cooking for one minute to bloom the spices.
Pour in the chicken broth and bring the liquid to a gentle boil.
Place the chicken breast into the pot, reduce the heat to low, and simmer for about 12-15 minutes until the chicken is cooked through.
Remove the chicken from the pot, shred it with two forks on a cutting board, and return the meat to the soup.
Add the soba noodles to the simmering broth and cook for 5 minutes until they reach a perfect al dente texture.
Turn off the heat and stir in the freshly chopped parsley before ladling the soup into a large bowl.