For a richer flavor, consider using vanilla bean paste instead of a whole bean. Feel free to experiment with different apple varieties. Honeycrisp or Gala apples would also work well. A sprinkle of chopped pecans or walnuts after roasting adds a delightful crunch. If you don't have a spiralizer, you can cut the sweet potato and apple into thin matchsticks. Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently in the oven or microwave.