Preheat your oven to 350°F (175°C).
If using muffin liners, place them in the muffin tin. If not, lightly grease the muffin cups.
In a large mixing bowl, combine the mashed sweet potato, almond milk, brown sugar, granulated sugar, and vanilla extract. Whisk until smooth.
In another bowl, whisk together the all-purpose flour, baking powder, and ground cinnamon.
Gradually add the dry ingredients to the wet ingredients, stirring gently with a spatula until just combined.
Scoop the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
Let the muffins cool in the tin for about 5 minutes before transferring them to a wire rack.