For extra flavor, try adding a pinch of smoked paprika or red pepper flakes to the vegetables before roasting. Feel free to substitute other root vegetables like parsnips or turnips for the sweet potato or carrot. Italian sausage or chorizo would also work well in place of the kielbasa. If you like, toss the vegetables with a tablespoon of balsamic vinegar after the first 20 minutes of roasting for added depth of flavor.