Cut the chicken breast into bite-sized pieces and season lightly with salt and pepper.
Dice the carrot, celery, and onion, and mince the garlic.
In a large pot over medium heat, lightly sauté the onion, garlic, carrot, and celery until they start to soften, about 3-4 minutes.
Add the chicken pieces and continue to cook until they are lightly browned on all sides.
Pour in the low sodium chicken broth and bring the mixture to a simmer. Allow it to cook for about 10 minutes, letting the flavors meld and the vegetables become tender.
Stir in the fresh spinach and low fat milk for creaminess, simmering for an additional 2 minutes.
While the stew simmers, prepare the herb dumplings by combining whole wheat flour, egg white, dried thyme, dried parsley, and a pinch of salt in a small bowl. Mix until a smooth, slightly sticky dough forms.
Using a teaspoon, drop small dollops of the dumpling dough onto the simmering stew. Ensure they are spaced apart as they will expand slightly.
Cover the pot and let the dumplings steam within the stew for about 8-10 minutes, or until they are cooked through and tender.
Taste and adjust seasoning with salt and pepper if needed. Serve the stew hot, enjoying the creamy broth and tender dumplings.