Preheat the oven to 350ºF.
In a large bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, ginger and cloves. Set it aside.
In a stand mixer fitted with the paddle attachment, beat together the eggs, pumpkin, sugar and oil.
Add the flour mixture to the stand mixer and mix well then add 2/3 cup of the chopped pecans.
Spread the mix into an ungreased 15x10x1" cookie sheet. Bake the pumpkin bars for 25 to 30 minutes, until a toothpick inserted comes out clean.
Remove the bars from the oven and let them cool completely while you prepare the frosting.