Simple and sweet, these potatoes will be a huge hit! 4 pounds sweet potatoes 6 tablespoons unsalted butter, at room temperature 1/2 cup apple butter Salt Preheat the oven to 350°. Pierce the sweet potatoes all over with a fork and place on a large rimmed baking sheet. Bake for 1 1/2 hours, or until very tender. Peel the sweet potatoes and transfer to a large bowl. Mash with a potato masher until creamy, then mash in the butter and apple butter. Season with salt and serve.