These twice-baked sweet potatoes deliver a perfect balance of natural sweetness and smoky heat. The tender potato flesh is scooped out and mashed with spicy chipotle chiles and adobo sauce until light and fluffy. Stuffed back into their skins, they bake until golden brown and piping hot. A cool dollop of sour cream and a sprinkle of fresh cilantro finish off this comforting side dish. It makes an excellent companion to roasted meats or a satisfying vegetarian main course.