Heat oven to 350 degrees F.
Spray 9"x4" loaf pan with baking spray.
Sift together flour, baking soda, baking powder, salt, cinnamon, nutmeg, allspice, and ginger. Set aside.
In a medium bowl, whisk together the pumpkin and eggs. Set aside.
With an electric mixer, beat butter and sugar until creamy, 2-3 minutes.
Beat in pumpkin mixture.
Add dry ingredients.
Mix until smooth.
Spoon into prepared pan.
Spread batter evenly.
Bake for 60-70 minutes, or until bread tests done.