Preheat the oven to 350°F (175°C).

Grease your 9x13 inch baking pan or line it with parchment paper.

In a large bowl, combine the granulated sugar, brown sugar, and vegetable oil. Whisk until well blended, then add the eggs and pumpkin puree, mixing until smooth.

In another bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, and salt.

Gradually add the dry mixture to the wet ingredients, stirring gently until just combined.

Pour the batter into the prepared baking pan, spreading it evenly.

Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Allow the bars to cool in the pan for about 10 minutes before transferring to a wire rack.

Once fully cooled, cut into squares.