Combine the frozen chicken breasts, cream of chicken soup, chicken broth, chicken gravy mix, butter, black pepper, onion powder, and a pinch of dried parsley in the crockpot. Stir the mixture until well blended.
Set the crockpot to cook on high for approximately 5 hours. Once the chicken is fully cooked and tender, use a fork to shred it directly within the crockpot.
Add the frozen noodles and mixed vegetables to the crockpot. Mix gently and continue cooking on high for an additional hour, or until the noodles reach the desired tenderness.
Serve the dish hot alongside freshly baked biscuits for a complete, comforting meal.