Preheat oven to 375 degrees.
Mix together sugar and margarine.
Add eggs, sour cream and pumpkin.
Sift together remaining dry ingredients.
Add this mixture to the wet ingredients and combine well.
Form dough into two balls.
Place each ball onto a greased cookie sheet and flatten into a larger circle about 1" thick.
Cut each ball into eight wedges and place on a parchment lined cookie sheet.
Bake for 20-25 mins.
Drizzle with icing sugar (optional).