Preheat the oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.
In a large mixing bowl, combine the pumpkin puree, vegetable oil, brown sugar, granulated sugar, eggs, and vanilla extract. Mix well until smooth.
In a separate bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, nutmeg, ginger, and cloves.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Do not overmix. If using, fold in the chopped nuts.
Pour the batter into the prepared loaf pan and smooth the top.
Bake in the preheated oven 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, then transfer it to a wire rack to cool completely before slicing.
