Heat the olive oil in a medium pot over medium heat.
Add the diced chicken breast, carrots, celery, and onion, sautéing until the chicken is lightly browned and vegetables begin to soften.
Pour in the chicken bone broth and add the thyme, rosemary, sea salt, and black pepper, bringing the mixture to a gentle simmer.
In a small mixing bowl, combine the whole wheat flour, baking powder, and 1 tablespoon of the Greek yogurt, stirring until a soft dough forms.
Using a small spoon, drop rounded teaspoons of the dough into the simmering stew, spacing them out evenly.
Cover the pot with a tight-fitting lid and simmer for 10 minutes without lifting the lid, allowing the dumplings to steam and become fluffy.
Remove the pot from the heat and gently stir in the remaining 2 tablespoons of Greek yogurt to create a rich, creamy finish.