Preheat oven to 375 degrees. Chop onion. Beat eggs. Pour 8 cans of chicken broth in a big pot. Crumble white bread and corn bread into the same pot. Add onion, eggs, salt & pepper to taste. Add 1 to 2 handfuls of sage (be careful not to turn the mixture green). Use a potato masher to mash all of the ingredients together. Add more chicken broth if consistency is thicker than a thin milkshake. Pour mixture in a large baking pan. Bake in prepared oven for 1 ½ - 2 hours.