In a large pot, bring the chicken and broth to a simmer over medium heat. Cook for 45 minutes or until the chicken is tender.
Remove the chicken from the pot, shred the meat, and discard the bones. Set aside.
In the same pot, add onions, carrots, celery, salt, pepper, thyme, and garlic powder. Cook until vegetables are tender.
Meanwhile, prepare the dumplings by mixing flour, baking powder, and salt in a bowl.
Slowly add milk and melted butter, stirring until a dough forms.
Drop spoonfuls of dough into the simmering broth. Cover and cook for 15 minutes, or until dumplings are cooked through.
Return the shredded chicken to the pot, stir, and simmer for an additional 5 minutes.
Serve hot and enjoy!