Preheat oven to 350°F. Place potato and apple chunks in 13- x 9-inch baking dish, and drizzle with oil and honey. Sprinkle with cinnamon, and season with salt, if desired. Cover with foil, and bake 30 minutes. Remove foil, and bake 30 minutes more, or until very tender. Cool 5 minutes. Transfer mixture to food processor, and purée until smooth.