Butter one 9x13 inch baking pan. Preheat oven to 350 degrees F (175 degrees C).
In a large bowl combine shortening, brown sugar, flour, baking soda, baking powder, cinnamon, ginger, nutmeg, vanilla pumpkin and eggs. Mix until smooth. Spread evenly in pan and bake for 25 minutes. Frost with cream cheese frosting when cooled.