I subbed regular potato instead of the sweet potato. I just didn't think I would like the sweet potato with the spicy flavors. It was wonderful! My vegan sister in law loved it. She had it with guacamole instead of the sour cream. These also freeze beautifully.
I halved this recipe and substituted a heaping TBL of chopped green chilies in place of the jalapeno. Served on a bed of baby mixed salad greens with slices of tomato/cucumber and shredded carrot on the side with the lime sour cream. Delicious!