Preheat your oven to 350°F (175°C).
Mash the sweet potatoes until smooth and set aside.
In a large mixing bowl, combine the granulated sugar, brown sugar, and vegetable oil.
Add the mashed sweet potatoes, eggs, and vanilla extract to the sugar mixture, and mix well.
In a separate bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
Pour the batter into a greased loaf pan.
Bake for 60-70 minutes or until a toothpick inserted into the center comes out clean.
Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack.
Slice and serve the bread once completely cooled.
