Method:
Heat oven to 300°F. Spread bread cubes out on a large baking sheets and bake, stirring once, until dried but not browned, 15 to 20 minutes. Transfer to a large bowl.
Meanwhile, in a large skillet, heat oil over medium-high heat. Add sausage and cook, breaking up chunks with the side of a spoon, until browned, about 6 minutes. Transfer sausage to bowl with bread with a slotted spoon. Return skillet to medium heat and add half the kale and 1/4 cup water. Cook, stirring, until kale is wilted; stir in remaining kale. Continue to cook, stirring frequently, until kale is tender, about 8 minutes, adding more water by tablespoons if necessary. Add onion, garlic, celery and butter and cook until vegetables are tender, about 6 minutes. Stir in apples and cook 3 minutes. Scrape vegetable mixture into bowl with bread and toss. Add broth, thyme, salt and pepper and toss again.
If using to stuff a turkey, cool completely before stuffing. If baking separately, heat oven to 350°F; bake in a buttered casserole dish until lightly browned and crisp on top, 50 to 60 minutes.