Gather all the ingredients needed for both the bars and the frosting.
Preheat your oven to 350°F (175°C).
For the bars, whisk together the pumpkin puree, sugar, oil, and eggs in a medium bowl until smooth and well mixed.
In another bowl, combine the flour, cinnamon, cloves, nutmeg, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the pumpkin mixture, stirring until fully incorporated.
Pour the batter into an ungreased 18x13-inch jelly roll pan and spread it evenly.
Bake for 25 to 30 minutes, or until the bars bounce back when gently pressed. Remove from the oven and let them cool completely.
While the bars are cooling, prepare the frosting. Beat together the butter and cream cheese until creamy. Add the vanilla bean paste and maple syrup, then gradually mix in the confectioners' sugar until smooth.
Once the bars have cooled completely, spread the frosting evenly over the top and cut into 24 squares.
Serve and enjoy your delicious pumpkin bars!