I am a serious sweet potato nut! My husband and I often joke about my addiction to root vegetables, and sweet potatoes are my favorite. While I'm partial to the white-fleshed Japanese/Korean sweet potatoes (which taste like a cross between sweet potato, potato, and chestnuts), I also love the classic orange-flesh kind and am always interested in different ways to cook with it. So is it any wonder I've wanted to make sweet potato soufflé for some time now? With root vegetables like sweet...