Preheat oven to 350 degrees F. Lightly grease a jelly roll pan that is 15.5 x 10.5 x 1 inch.
In a large mixing bowl (or the bowl of a stand mixer), beat eggs, oil, pumpkin, and sugar until smooth.
Whisk in flour, cinnamon, baking powder, baking soda, salt, ginger, nutmeg, and cloves until well mixed. Spread batter evenly in jelly roll pan.
Bake for 25-35 minutes or until light brown and toothpick inserted in center comes out clean. Cool in pan on a wire rack until completely cooled (usually about 2 hours).
Make cream cheese frosting. Beat cream cheese, butter, and vanilla together in a mixing bowl on low speed until smooth. Then add the powdered sugar gradually, about 1 cup at a time, until frosting is smooth and of a spreadable consistency.
Store bars in refrigerator.
Notes
You can decrease the sugar in the bar part of the recipe by up to one cup and these will still turn out delicious if you add the frosting!You can decrease the sugar in the frosting by 1/2 cup and it will still be good, but the texture of the frosting is less creamy and smooth, and more buttery. But still good!