Instructions:
- Preheat oven to 350°F (175°C). Thoroughly grease and flour a standard 9x5 inch metal loaf pan, or line it with parchment paper.
- In a large bowl, whisk together the flour, baking soda, cinnamon, ginger, nutmeg, cloves, and salt until uniformly combined.
- In a separate, medium bowl, whisk together the granulated sugar, brown sugar, pumpkin purée, melted butter, eggs, and vanilla extract until smooth.
- Pour the wet mixture into the dry ingredients. Gently fold with a rubber spatula until just combined. Stop mixing as soon as no streaks of dry flour remain; overmixing develops gluten.
- If using, gently fold in the toasted nuts.
- Transfer batter to the prepared loaf pan, spreading the top evenly.
- Bake for 60 to 70 minutes. The loaf is done when a wooden skewer inserted into the center comes out clean.
- Let the loaf cool in the pan on a wire rack for 10 minutes, then carefully lift it out to cool completely before slicing.