Ingredients

1 Cup oil
2 Cup sugar
15 Ounce canned pumpkin
4 eggs
2 Cup flour
2 Teaspoon baking powder
1 Teaspoon baking soda
1/2 Teaspoon salt
2 Teaspoon cinnamon
6 Ounce cream cheese, softened
2 Teaspoon vanilla
1 1/2 sticks butter, softened
3 1/2 Cup powdered sugar (3 1/2 to 4 cups)

Instructions

Mix together the first nine ingredients. Pour into a greased 10x15-inch pan and bake at   350 degrees F for 20-25 minutes. Once bars are cooled, mix the remaining ingredients together into a frosting and spread on bars.