Heat oven to 350°F
In a large bowl mix together the pumpkin, sugar, eggs, oil, and vanilla extract
In a separate bowl, whisk together the flour, cinnamon, salt, baking soda, and baking powder
Combine the dry ingredients to the wet ingredients and mix well until smooth. Do not over mix
Pour the batter into a pan and spread out evenly
Bake for 30 minutes or until done. You can poke a toothpick in the middle to see if it comes out clean and you'll know it's done. Let the pumpkin bars cool.