In a large Dutch oven or pot, combine cream of chicken soup and chicken broth. Stir until well blended over medium heat.
Add shredded chicken, frozen vegetables, diced onion, celery, thyme, garlic powder, and black pepper. Bring to a gentle simmer and cook for 5 minutes, stirring occasionally.
While the soup simmers, open the can of biscuits and cut each biscuit into 4 equal pieces.
Drop the biscuit pieces one at a time into the simmering soup. Do not stir after adding the dumplings.
Cover the pot and reduce heat to low. Allow the dumplings to cook for 10-12 minutes or until they are puffy and cooked through.
Remove from heat, garnish with fresh parsley if desired, and let stand for 2-3 minutes before serving.