Heat the olive oil in a medium pot over medium-high heat and add the cubed chicken breast, searing until golden on all sides.
Add the diced onion, sliced carrots, and sliced celery to the pot, sautéing for 5 minutes until the vegetables begin to soften.
Pour in the chicken broth, sea salt, black pepper, and dried thyme, then bring the mixture to a gentle boil.
In a small bowl, whisk together the whole wheat flour and baking powder, then stir in the water until a thick dough forms.
Reduce the heat to a low simmer and drop small spoonfuls of the dough into the bubbling broth.
Cover the pot tightly with a lid and cook for 10 to 12 minutes without lifting the lid to ensure the dumplings steam properly.
Remove from heat and gently stir in the Greek yogurt to create a creamy finish without breaking the dumplings.
Garnish with fresh chopped parsley and serve immediately while hot.