Fabulous Pumpkin Cookies

Holly got this recipe from her beautiful friend, Brittney, and we have fallen in love with these cookies. These are a must have in the Fall.
2 cups sugar
1 cup shortening
1 cup butter, soft
*mix then add:
2 eggs
2 tsp. vanilla
2 cups pumpkin
*mix then add:
2 tsp. baking soda
4 tsp. baking powder
1 tsp. salt
2 tsp. cinnamon
2 tsp. pumpkin pie spice
2 tsp. nutmeg
2 tsp. cloves
5 cups flour
1 bag chocolate chips

Bake at 350 for 15 minutes. Cool before frosting with...

1 cube butter, soft
4 cups powdered sugar
1/4 cup milk
1 tsp. vanilla
dash of salt