Old-Fashioned Southern Cornbread Dressing – Classic Holiday Favorite

2 cups chopped onions

2 cups chopped celery

1/2 cup butter

4 cups finely crumbled toasted bread

4 cups finely crumbled cornbread

1 tablespoon salt

2 teaspoons freshly ground black pepper

1 tablespoon dried sage

Turkey broth OR chicken broth (enough to moisten to desired consistency)

4 large eggs, beaten

2–3 hard-boiled eggs, chopped (optional)