Dice the chicken breast into bite-sized pieces and season with a pinch of sea salt and black pepper.
Heat the olive oil in a small pot over medium heat. Add the diced carrots, celery, and onion, sautéing until the onion is translucent.
Stir in the minced garlic, dried thyme, and dried rosemary, cooking for 1 minute until fragrant.
Add the chicken pieces to the pot and cook until the outsides are browned.
Pour in the chicken broth and bring the mixture to a gentle simmer.
While the broth simmers, prepare the dumplings by whisking the whole wheat flour, baking powder, and a pinch of salt in a small bowl.
Add the beaten half-egg to the flour mixture and stir until a soft dough forms.
Drop small spoonfuls of the dough into the simmering broth. Cover the pot and cook for 10-12 minutes until the dumplings are puffed and cooked through.
Remove the pot from the heat and gently stir in the Greek yogurt to create a creamy finish without curdling.
Season with additional sea salt and black pepper to taste before serving.