I got this recipe from the better homes and gardens website (http://www.bhg.com) and modified a little bit.

Ingredients:

• 2 cups all purpose flour
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon ground cinnamon
• 1 teaspoon ground pumpkin spice mix
• ¼ teaspoon salt
• 4 eggs at room temperature
• 1 15 oz can pumpkin puree
• 1 cup castor sugar
• ¾ cup canola oil
• 1 teaspoon vanilla extract
• ½ cup chopped walnuts

Direction:

• Pre heat oven to 350F.  Grease a 15x10x1 inch baking pan and set aside
• Sift together flour, baking powder, baking soda, salt, cinnamon and pumpkin spice mix and set aside
• In a medium bowl beat egg, sugar and vanilla extract.
• Add oil, and pumpkin puree and beat with an electric mixer on medium speed
• Add the flour mixture and beat until combined.
• Stir in chopped walnuts
• Pour the batter into prepared pan and bake for about 30 minutes or until a wooden tooth pick inserted in the center comes out clean
• Cool completely on a wire rack.

Note: I usually reduce the amount of sugar when I bake cookies, cake etc.  So if you would like it to be quite sweet, add extra 1/3 cup of sugar.

For a variation, add about ¼ cup of chocolate chips or raisins into the cake mix.