Preheat oven to 350° F and prepare a baker’s half sheet baking tray (approximately 12 x 17 inches). Line with parchment paper (recommended) or grease with cooking spray.
In a large bowl, whisk together sugar, vegetable oil, and eggs. Mix until smooth and add pumpkin and vanilla. Whisk until combined.
In a separate bowl, combine all dry ingredients and mix until combined.
Gently stir all dry ingredients into the large bowl of wet ingredients and mix until incorporated and smooth.
Pour the batter into the prepared pan and spread so the batter is even. Bake in the preheated oven for approximately 20-22 minutes or until center is baked.
Let bars cool completely before frosting with cream cheese frosting.