How to Make It
Preheat oven to 350°F. Toss together 5 cups cornbread cubes, torn white bread, 1/2 cup melted butter, and sage in a large bowl. Heat a large skillet over medium-high. In 2 batches, add cornbread mixture to skillet; cook, stirring, until bread is toasted, 5 to 8 minutes. Transfer corn-bread mixture to a large bowl, and set aside. Wipe skillet clean.
Add bacon to skillet; cook over medium, stirring often, until crisp, about 12 minutes. Using a slotted spoon, remove bacon; add to cornbread mixture. Reserve 2 tablespoons bacon drippings in skillet; discard remaining drippings or reserve for another use. Add onion, apple, celery, parsley, thyme, 1/2 teaspoon salt, and 1/4 teaspoon black pepper; cook, stirring occasionally, until softened, about 5 minutes. Add onion mixture to cornbread mixture. Crumble remaining 5 cups cubed cornbread into cornbread mixture.
Whisk together 3 cups broth, eggs, remaining 1/2 teaspoon salt, and remaining 1/4 teaspoon pepper in a medium bowl until blended. Fold into cornbread mixture. Spoon mixture into a 13- x 9-inch baking dish. Drizzle with remaining 1/2 cup broth and remaining 1/4 cup melted butter. Bake in preheated oven until lightly toasted, about 35 minutes.