Preheat the oven to 375 F. Spray or line a mini muffin tin with paper liners.
Mix the oats, flour, baking soda, baking powder, nutmeg, and cinnamon in a bowl. Stir to combine.
Add the sweet potato puree, vegetable oil, milk, and egg to the same bowl, and stir until completely combined.
Spoon the batter into the prepared mini muffin tin, filling each muffin to the top of the tin.
Bake for 12-15 minutes, until toothpick comes out clean!
OPTIONAL - Brown Sugar Glaze. Add brown sugar and butter to a microwavable bowl. Microwave for 30-45 seconds, until butter has melted. Stir until combined. Dip the top of each muffin into the glaze, and let set.
Enjoy!