Dice the chicken breast into bite-sized pieces and season with half of the sea salt and black pepper.
Heat olive oil in a medium pot over medium heat and sear the chicken until golden brown on all sides, then remove and set aside.
In the same pot, add the diced onion, carrots, and celery, sautéing until the vegetables are softened and fragrant.
Stir in the dried thyme, dried rosemary, and the remaining salt and pepper, then pour in the chicken bone broth and bring to a gentle simmer.
While the broth simmers, whisk together the whole wheat flour and baking powder in a small bowl, then fold in the Greek yogurt and water until a soft dough forms.
Return the seared chicken and the frozen peas to the pot.
Drop small spoonfuls of the dough into the simmering broth, cover the pot with a tight-fitting lid, and cook for 10-12 minutes until the dumplings are puffed and cooked through.