Start by prepping your vegetables and placing the chicken in the slow cooker. Sprinkle on salt, pepper, garlic powder, onion powder, and poultry seasoning. Then add diced onions, celery, potatoes, and frozen vegetables for a hearty base.
Whisk together the cream of chicken soup, milk, and chicken broth in a bowl until smooth. Pour this mixture over the chicken and vegetables, making sure everything is evenly coated without disturbing the chicken at the bottom.
Cover the slow cooker and cook on low for 6–8 hours or high for 3–4 hours, until the chicken reaches an internal temperature of 165°F. About 20 minutes before serving, bake the biscuits according to package directions.
Remove the chicken and shred it with two forks. Return it to the slow cooker and stir gently to combine with the creamy vegetables and sauce.
Spoon the filling into bowls and top each serving with a freshly baked biscuit, or try alternative toppings like puff pastry, crescent rolls, or mashed potatoes.