Dice the chicken breast, carrots, celery, and onion into uniform bite-sized pieces.
Heat the olive oil in a medium pot over medium heat and sauté the onion, carrots, and celery until they begin to soften.
Add the diced chicken, dried thyme, sea salt, and black pepper to the pot, then pour in the chicken bone broth.
Bring the liquid to a gentle simmer and cook for about 10 minutes until the chicken is nearly cooked through.
While the soup simmers, whisk the whole wheat flour and baking powder together in a small bowl, then fold in the Greek yogurt until a soft dough forms.
Stir the frozen peas into the pot to brighten the color and add a touch of sweetness.
Drop rounded tablespoons of the dumpling dough onto the surface of the simmering broth, leaving space between them.
Cover the pot tightly with a lid and steam for 10 to 12 minutes without lifting the cover until the dumplings are puffed and cooked through.