Preheat your oven to 375 and spray your mini muffin pan with cooking spray or line with liners.
Peel and cube your sweet potato and cook until soft (boil or steam).
In a mixing bowl, combine the mashed sweet potato, milk, maple syrup, avocado oil, egg, and vanilla extract. Mix until well combined.
Add the flour, baking powder, ground cinnamon, and a pinch of salt to the wet ingredients. Stir until just combined. Be careful not to overmix.
Spoon the batter into the prepared mini muffin cups, filling each about 2/3 to 3/4 full.
Place the muffin tin in the preheated oven and bake for 15-20 minutes, or until the muffins are golden brown and a toothpick inserted into the center comes out clean.
Allow the mini muffins to cool in the tin for a few minutes, then transfer them to a wire rack to cool completely.
Serve and enjoy!