Savory Croissant Stuffing

Name: Savory Croissant Stuffing
Ingredients: 1/2 cup unsalted butter, cut into pats, divided; 1 pound hot Italian sausage; 1 large Pink Lady or Honeycrisp apple, thinly sliced (about 2 1/2 cups); 1 yellow onion, chopped (about 1 1/2 cups); 3 celery stalks, chopped (about 1 cup); 3 garlic cloves, finely chopped (about 1 tablespoon); 1/3 cup dry white wine; 1/4 cup chopped fresh parsley; 3 tablespoons chopped fresh sage, plus small sage leaves, for garnish; 1 1/2 pounds day-old mini croissants (18 to 20 [4- to 4 1/2-inch] croissants); 2 cups unsalted chicken broth; 1 1/2 teaspoons poultry seasoning; 1 teaspoon kosher salt; 2 large eggs