Preheat oven to 350º. Line a 15 "x 10" jelly roll pan with parchment paper.
In a medium bowl, whisk together the dry ingredients: flour, baking soda, baking powder, cinnamon and set aside.
In a large bowl, whisk together wet ingredients: eggs, vegetable oil, pumpkin puree, and sugar, until well combined.
Add dry ingredients to wet ingredients and whisk until well combined.
Pour batter into prepared jelly roll pan. Bake for 20-25 minutes until a toothpick comes out clean.
Let cool completely, then spread the top with frosting. We like to garnish these bars with fall color sprinkles and cute pumpkin candies. ENJOY!