- In a large pot, melt the butter over medium heat. Add diced onion, sliced carrots, and celery. Cook until softened, about 5–6 minutes. 
- Add shredded chicken and chicken broth. Simmer for 5–7 minutes. 
- Stir in milk, garlic powder, salt, and pepper. Simmer an additional 2–3 minutes. 
- In a mixing bowl, combine Bisquick and milk. Stir gently until just combined. 
- Drop spoonfuls of dough onto the surface of the simmering stew. Do not stir. 
- Cover the pot and let the dumplings steam for 15–18 minutes, until cooked through and fluffy. 
- Check seasoning, garnish with parsley if desired, and serve hot.