Preheat the oven to 350 degrees and line 10-12 muffin tins with patty pans and set aside.
In a large high-speed blender, combine all the ingredients and blend until a smooth batter remains.
Evenly distribute the batter amongst the 12-muffin tin until almost full. Top with extra cinnamon and bake for 25-30 minutes, or until a toothpick or skewer comes out clean.
Remove from oven and allow to sit for 10 minutes, before removing and allowing to cool on a dry surface.
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Notes
TO STORE: Muffins can be kept at room temperature, provided they are to be enjoyed within 3 days. To keep sweet potato muffins fresh, store them in a sealed container and keep in the fridge. They will keep fresh for 7 days. TO FREEZE: Sweet potato muffins are freezer friendly and can be stored in the freezer. Place muffins in a ziplock bag. They will keep fresh for up to 6 months.