Preheat your oven to 350°F (175°C) and line a 9×13 inch baking pan with parchment paper.

In a bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.

In another bowl, mix pumpkin puree, granulated sugar, brown sugar, eggs, and vegetable oil until smooth.

Gradually combine dry ingredients with wet ingredients until just mixed.

Pour batter into the prepared pan and bake for about 25-30 minutes or until a toothpick comes out clean.

Allow to cool before preparing the frosting by mixing softened cream cheese, powdered sugar, and vanilla until fluffy.

Spread frosting over cooled bars and slice into squares.