Preheat the oven to 350°F (175°C). Grease a 9x13 inch baking pan.

In a large mixing bowl, combine the pumpkin puree, granulated sugar, vegetable oil, eggs, and 1 teaspoon of vanilla extract. Mix until well combined.

In another bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, and salt.

Gradually add the dry ingredients to the pumpkin mixture, stirring until just combined.

Pour the batter into the prepared baking pan and spread it evenly.

Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.

While the bars are baking, prepare the cream cheese frosting. In a mixing bowl, beat the softened cream cheese and unsalted butter together until smooth.

Gradually add the powdered sugar and 1 teaspoon of vanilla extract, and continue to beat until fluffy and well combined.

Once the pumpkin bars are baked, remove them from the oven and let them cool completely in the pan on a wire rack.

After the bars have cooled, spread the cream cheese frosting evenly over the top.

Cut into squares and serve.