Preheat the oven to 180C fan-forced and grease or line 10 holes of a 12 hole muffin tin.
Mix the oats, flour, baking soda and spices together in a bowl.
In another bowl, combine the mashed sweet potato, sugar, oil, milk and egg.
Make a well in the middle of the dry ingredients and pour in the wet then stir together until just combined.
Divide the batter between the 10 holes (sprinkle with extra oats if you want to make them a bit fancy) and bake for 15-20 minutes or until a cake tester inserted in the middle of one muffin comes out clean.
Notes
These also freeze well in a container or ziplock bag.