Preheat oven to 350 degrees F. Lightly grease the bottoms and sides of a 15x10-inch pan or a 9x13-inch pan with shortening.
In a large mixing bowl, beat the eggs, sugar, oil, and pumpkin until smooth.
Stir in the flour, baking powder, cinnamon, baking soda, salt, ginger and cloves.
Pour the batter into your cake pan and bake for 25-30 minutes or until golden brown.
Cool bars completely while still in the pan. It will take approximately 2 hours.
In a medium mixing bowl, beat the cream cheese, butter, and vanilla until smooth. Gradually add in the confectioner's sugar, one cup at a time, until smooth and spreadable.
When completely cool, frost the bars and garnish with a light dusting of cinnamon.
Place bars in the fridge until firm. Cut bars into desired size and serve. Refrigerate leftovers.