Preheat oven to 350 or 400 (see notes). In a small bowl, combine flour, baking powder, baking soda, cinnamon, and salt. Set aside.
In a medium bowl, whisk together oil and sugar, vanilla, egg, and lastly sweet potatoes.
Slowly stir in flour mixture to wet ingredients until just combined. Spoon batter into muffin wells and bake for 20-25 minutes, or until a toothpick comes out clean.
Transfer to a wire rack to cool, and store any leftovers in an airtight container.
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Notes
For the simplest baking experience, cook at 350 for 20-25 minutes. For slightly more rise, start at 400 degrees and lower the temperature to 325 5 minutes into baking.If you're not using leftover sweet potatoes that have butter and sugar in them already, increase brown sugar to ⅓ cup and oil to ½ cup.
Nutrition information is provided as a courtesy and is an estimate. It is recommended to use your preferred calculator with the actual ingredients you use for optimal accuracy.