Preheat your oven to 350°F (175°C).
Prepare a loaf pan by greasing it lightly with oil or lining it with parchment paper.
In a large bowl, mix the flour, baking soda, baking powder, salt, cinnamon, nutmeg, and allspice.
Stir until these dry ingredients are well combined.
In another bowl, beat together the eggs, pumpkin puree, vegetable oil, granulated sugar, and brown sugar until smooth.
This is your wet mixture.
Slowly add the wet mixture to the dry ingredients, stirring gently until just combined.
Be sure not to overmix as this can make the bread dense.
Pour the batter into your prepared loaf pan.
Bake in the oven for 60-70 minutes, or until a toothpick inserted into the center comes out clean.