Preheat the oven to 350°F.
Grease a 10 x 14-inch baking pan.
Whisk the eggs and add the pumpkin puree, oil, granulated sugar, light brown sugar, and vanilla extract. Mix well.
Mix in the flour, kosher salt, baking soda, baking powder, and ground cinnamon.
Pour the batter into the prepared pan and bake for 20-30 minutes or until a toothpick inserted into the center comes out clean.
Let the bars cool completely in the pan before frosting.
Beat the cream cheese and unsalted butter until smooth.
Gradually add the powdered sugar and mix until smooth and creamy.
Spread the frosting over the cooled bars.