This chicken pot pie casserole is the perfect easy weeknight meal! It is is a great, ... 2 1/2- Cup Bisquick or other All- Purpose Baking Mix. 1 1/4 Cup Milk . 4 Tbsp Butter Melted .

1 pound boneless, skinless chicken breasts, diced; 1 cup diced carrots; 1 cup frozen peas; ½ cup diced celery; 1/3 cup butter; 1/3 cup chopped onion; 1/3 cup all-purpose flour ...