
Preheat the oven to 350°F. Line a 12-count muffin pan with parchment paper cups, then spray with non-stick cooking spray.
In a large bowl, whisk together the flour, sugar, baking powder, cinnamon, and salt. Set aside.
In another large bowl, whisk together the mashed sweet potatoes, almond milk, and vanilla extract until smooth.
Add the dry ingredients to the sweet potato mixture. Stir with a wooden spoon until combined.
Scoop the batter into the prepared muffin pan, filling each muffin cavity about ¾ full.
Bake for 25–30 minutes or until a toothpick inserted into the center of a muffin comes out clean. Cool completely on a wire rack and serve.