Preheat your oven to 350°F (175°C).
In a large mixing bowl, whisk together the pumpkin puree, granulated sugar, brown sugar, and oil until fully combined.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour, baking soda, baking powder, salt, and spices.
Gradually fold the dry ingredients into the pumpkin mixture until just combined.
If using, gently fold in the chopped nuts.
Pour the batter into a greased loaf pan, smoothing the top with a spatula.
Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10 minutes before transferring to a wire rack.
Slice and enjoy your delicious pumpkin bread warm or at room temperature!