Cook in slow cooker set to Low until sauce thickens and chicken is cooked through, 4 to 5 hours. If sauce is too thin, mix water and cornstarch together in a small bowl and pour slowly into chicken mixture. Cook in slow cooker set to High until thickened, 15 minutes. … 10 Apple Crumble Recipes for Celebrating Fall If you're craving a sweet fall treat, look no further than these apple crumble recipes. Crumbles get their name because the fruit filling is typically covered with a crumbly mix of butter, flour, and sugar, creating a delightful golden brown topping once baked.