Heat the olive oil in a large stockpot over medium heat.
Add the diced onion, carrots, and celery, sautéing for about 8 minutes until the vegetables are softened.
Stir in the minced garlic, dried thyme, sea salt, and black pepper, cooking for 1 minute until fragrant.
Pour in the chicken bone broth and add the bay leaf, then bring the mixture to a gentle simmer.
Place the whole chicken breasts into the simmering broth and poach for 15 minutes or until the internal temperature reaches 165 degrees.
Remove the chicken from the pot to a cutting board, shred into bite-sized pieces using two forks, and set aside.
Add the whole grain rotini to the simmering broth and cook until al dente according to the package directions.
Return the shredded chicken to the pot and stir in the fresh chopped parsley and lemon juice to brighten the flavors.
Serve in portions of approximately 2 cups each to yield eight hearty servings.