Dice the chicken breast into bite-sized pieces and season lightly with a pinch of the salt and pepper.
Heat the olive oil in a medium pot over medium-high heat and sauté the chicken until golden brown on all sides.
Add the diced carrots, celery, and onion to the pot, cooking for 5 minutes until the vegetables begin to soften.
Stir in the minced garlic and dried thyme, cooking for 1 minute until fragrant.
Pour in the chicken bone broth and bring the mixture to a gentle simmer.
In a small mixing bowl, whisk together the whole wheat flour, baking powder, remaining salt, and remaining pepper.
Stir the Greek yogurt into the flour mixture until a soft, slightly sticky dough forms.
Drop small spoonfuls of the dumpling dough (about 1 teaspoon each) onto the surface of the simmering stew.
Cover the pot with a tight-fitting lid and simmer for 10 to 12 minutes without lifting the lid, allowing the dumplings to steam and puff up.
Remove from heat and garnish with freshly chopped parsley before serving in a deep bowl.