In a large pot, heat the avocado oil over medium heat and sauté the diced onion, carrots, and celery until the onions are translucent.
Pour in the chicken bone broth and add the whole chicken breast, simmering for 12-15 minutes until the chicken is fully cooked.
Remove the chicken to a cutting board, shred it into bite-sized pieces using two forks, then return it to the pot along with the frozen peas.
In a small bowl, whisk together the cassava flour, baking powder, sea salt, black pepper, and fresh thyme.
Stir 3-4 tablespoons of the hot broth into the flour mixture until a thick, tacky dough forms.
Drop rounded tablespoons of the dough into the simmering soup, cover with a tight-fitting lid, and steam for 8 minutes until the dumplings are puffed.
Ladle the soup and dumplings into bowls and garnish with fresh parsley.