Sausage and Apple Stuffing

Name: Sausage and Apple Stuffing
Ingredients: 1 tablespoon olive oil, plus more for the baking dish; 4 links sweet Italian sausage, casings removed (about 1 pound); 3 stalks celery, thinly sliced; 2 medium onions, chopped; 2 tart apples (such as Granny Smith or Pink Lady), cored and chopped; ¼ cup chopped fresh sage; kosher salt and black pepper; 1 large baguette (about ¾ pound), cut into ¾-inch pieces (about 7 cups); 3 cups low-sodium chicken broth; 2 large eggs, beaten