Chestnut and Apple Stuffing

Name: Chestnut and Apple Stuffing
Ingredients: 6 tablespoons butter, plus more at room temperature for pan and aluminum foil; 2 loaves Italian bread (about 10 ounces each), torn into bite-size pieces; 2 medium onions, chopped (2 cups); 2 stalks celery, halved lengthwise and cut crosswise into ½-inch pieces; Coarse salt and ground pepper; 2 large Gala or Fuji apples, peeled, cored, cut into 8 wedges, and cut crosswise into thin slices; 2 cans (14.5 ounces each) reduced-sodium chicken broth; ¼ cup coarsely chopped fresh sage; 1 jar (7 ounces) dry-packed cooked chestnuts, coarsely crumbled; 3 large eggs, lightly beaten