Preheat your oven to 350F. Grease and flour a 9x13-inch baking pan or line it with parchment paper for easy removal.
In a large mixing bowl, combine the granulated sugar, canned pumpkin, applesauce, and eggs. Mix until well combined.
In a separate bowl, whisk together the all-purpose gluten-free flour, baking powder, baking soda, pumpkin pie spice, and salt.
Gradually add the dry ingredients to the wet ingredients, stirring until the batter is smooth and all the ingredients are well incorporated.
Pour the batter into the prepared baking pan and spread it out evenly. Bake in the preheated oven for 30 minutes, or until a toothpick or cake tester inserted into the center comes out clean.
Once the pumpkin bars have cooled completely, spread the cream cheese icing evenly over the top. Cut the bars into squares or rectangles. Enjoy!