In a medium pot, combine the chicken bone broth, diced carrots, celery, onion, minced garlic, thyme, and parsley.
Bring the mixture to a gentle boil over medium-high heat, then reduce to a simmer.
Add the whole chicken breast to the broth and poach for 12-15 minutes until cooked through.
While the chicken cooks, whisk the cassava flour, baking powder, sea salt, pepper, and Greek yogurt in a small bowl to form a soft dough.
Remove the chicken from the pot, shred it with two forks, and return the shredded meat to the simmering broth.
Drop small spoonfuls of the dumpling dough into the simmering soup, covering the pot with a tight lid.
Steam the dumplings for 5-7 minutes without lifting the lid until they are firm and fluffy.
Ladle the chicken, vegetables, and dumplings into a bowl and serve immediately.