Chicken and Green Bean Casserole

Chicken stuffing (1 box (6oz))

Chicken breast (boneless and skinless, 3)

Black pepper (1/2 tsp)

Frozen green beans (1/2 pound)

Milk (1/4 cup)

Cream of mushroom soup (1 can (10.5 oz))

Mozzarella cheese (shredded, 1/2 cup)