This quantity will stuff a 15-18 pound turkey. Cornbread stuffing is good for chicken too.
Crumble the breads into a large bowl. Chop the giblets (or take the sausage meat) and cook with the vegetables in part of the butter until lightly browned. Melt the rest of the butter and add, with the vegetables, apple, herbs, and seasonings, to the bread. Stir to blend well and stuff into the bird just before roasting.