Herb and Onion Stuffing

Name: Herb and Onion Stuffing
Ingredients: 1/2 cup (1 stick) unsalted butter; 3 cups chopped onions (about 1 pound); 2 cups chopped celery (4 to 5 stalks); 1/4 cup chopped fresh Italian parsley; 2 tablespoons chopped fresh sage; 2 tablespoons chopped fresh marjoram; 12 cups (generous) 1-inch cubes day-old pain rustique or ciabatta bread with crust (about 1 1/4 pounds); 2 large eggs; 1 1/2 teaspoons fine sea salt; 1 teaspoon coarsely ground black pepper; 1 cup (or more) low-salt chicken broth