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 medium pot over medium heat and sauté the chicken until browned on all sides, then remove and set aside.
In the same pot, add the diced onion, carrots, and celery, sautéing for 5 minutes until the vegetables begin to soften.
Pour in the chicken broth and dried thyme, bring to a gentle simmer, and return the chicken to the pot.
In a small bowl, whisk together the whole wheat flour, baking powder, chopped parsley, and remaining salt and pepper.
Stir the water into the flour mixture until a thick dough forms.
Stir the frozen peas into the simmering broth.
Drop small spoonfuls of the dumpling dough onto the surface of the broth.
Cover the pot tightly with a lid and simmer on low for 10-12 minutes without lifting the lid until the dumplings are puffed and cooked through.
Serve warm in a shallow bowl, ensuring each portion gets plenty of vegetables and dumplings.