Dice the chicken breast into one-inch cubes and set aside.
Heat the olive oil in a large saucepan over medium-high heat.
Add the chicken cubes to the pan and cook until they are golden brown on all sides.
Stir in the diced onion, carrots, and celery, cooking for five minutes until the vegetables begin to soften.
Pour in the chicken broth and stir in the dried thyme, rosemary, sea salt, and black pepper.
Bring the stew to a gentle boil, then reduce the heat to a low simmer.
In a small mixing bowl, whisk together the whole wheat flour, baking powder, and water until a thick dough forms.
Use a small spoon to drop portions of the dough into the simmering broth.
Cover the pan with a tight-fitting lid and simmer for 12 minutes without lifting the lid to ensure the dumplings become fluffy.
Remove the pan from the heat and gently stir in the Greek yogurt until the broth is smooth and creamy before serving.