Preheat your oven to 350°F (175°C). Grease a loaf pan or line it with parchment paper.

In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, pumpkin pie spice, and salt.

In another bowl, mix the granulated sugar, brown sugar, pumpkin puree, water, vegetable oil, and vanilla extract until well combined.

Gradually add the wet ingredients to the dry ingredients, stirring just until combined. Avoid overmixing.

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

Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.

Allow the loaf to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.