perfect pumpkin cookies

2 cups sugar
1 cup shortening (1/2 butter, 1/2 Crisco)
1 can pumpkin
2 tsp vanilla
*Cream sugar and shortening. Add pumpkin and vanilla.
4 cups flour
2 tsp baking powder
2 tsp baking soda
2 tsp cinnamon
6-12 oz. chocolate chips
Bake at 350 for 10-12 minutes.