Heat the olive oil in a large pot over medium heat and sauté the onion, carrots, and celery until the onions are translucent and fragrant.
Add the diced chicken breast to the pot, searing until the exterior is golden brown.
Pour in the chicken bone broth and bring the mixture to a low boil, then reduce heat to maintain a steady simmer.
In a small mixing bowl, combine the whole wheat flour, baking powder, sea salt, black pepper, and minced thyme.
Gently fold the non-fat Greek yogurt into the dry ingredients until a thick, tacky dough forms.
Using a small spoon, drop rounded tablespoons of the dough directly into the simmering broth, ensuring they do not overlap.
Cover the pot with a tight-fitting lid and steam for 12 minutes without lifting the lid to ensure the dumplings become light and airy.
Ladle the soup and dumplings into bowls and garnish with fresh parsley before serving.