Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius) and line a 12-cup muffin tin with paper liners.
In a large mixing bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger.
In a separate bowl, whisk together the mashed sweet potato, vegetable oil, eggs, milk, and vanilla extract until well combined.
Pour the wet ingredients into the dry ingredients and stir with a spatula until just incorporated, ensuring no dry flour pockets remain.
Divide the batter evenly among the 12 muffin cups.
Bake for 20 to 25 minutes, or until a skewer inserted into the center of a muffin comes out clean.
Allow muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.