Homemade Chicken Pot Pie

boneless, skinless chicken chicken breast halves, cubed

sliced carrots

frozen green peas (or use 16oz bag of frozen carrots & peas)

sliced celery

large potato (or 2 small potatoes)

butter

chopped onion

all-purpose flour

coarse salt

black pepper

celery seed

carton chicken stock or broth for boiling (reserve 1 3/4 cups chicken broth)

milk

(9 inch) unbaked Pillsbury pie crusts