01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan or line with parchment paper.
02 - Whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, ginger, and cloves in a large bowl.
03 - Beat sugar, oil, eggs, pumpkin puree, and vanilla extract in another bowl until smooth.
04 - Gradually add dry ingredients to the wet mixture, mixing until just combined.
05 - Pour batter into the prepared pan, spread evenly, and bake for 22-25 minutes until a toothpick inserted in the center comes out clean. Cool completely in the pan.
06 - Beat cream cheese and butter in a medium bowl until smooth and creamy.
07 - Gradually add powdered sugar, vanilla extract, and salt. Beat until light and fluffy.
08 - Spread frosting evenly over cooled pumpkin bars. Cut into squares and serve.