Prepare stuffing as directed on package. Preheat oven to 425 degrees F.
Wash Cornish hens; pat dry. Stuff hens with prepared stuffing and place in baking pan with the breast side down. Tuck the tips of the wings into the side of the bird to prevent them from burning. Salt and Pepper birds. Pour 1 cup water into pan. Bake birds 15 minutes; baste with the butter or margarine. Reduce oven temperature to 350 degrees F. Bake for an additional 45 minutes to 1 hour, basting birds frequently with the pan drippings.