Add the ingredients to a standard blender and blend smooth. (Or place into a wide-mouth Mason jar or large measuring cup and blend smooth with an immersion blender.)
Serve cold, topped with a sprinkle of cinnamon or pumpkin pie spice if desired.
Notes
Store any leftovers in an airtight container in the fridge for 3-5 days.
Plan to prepare your sweet potato ahead of time and let it chill in the fridge before you make the pudding.