Preheat your oven to 350°F (175°C).
Grease a 9x5-inch loaf pan with oil or butter, or line it with parchment paper.
In a large bowl, whisk together the dry ingredients: gluten-free flour, baking powder, baking soda, cinnamon, nutmeg, ginger, cloves, and salt.
In another bowl, combine the wet ingredients: granulated sugar, brown sugar, pumpkin puree, vegetable oil, eggs, and vanilla extract. Mix until well combined.
Gradually add the dry ingredients to the wet ingredients and stir gently until just combined. Fold in nuts or chocolate chips if desired.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely before slicing.