Heat oven to 350°F. In large bowl, combine sugar, 1/2 cup brown sugar and 1 cup margarine; beat until light and fluffy. Add pumpkin, vanilla and egg; blend well. Add flour, baking powder, baking soda, cinnamon and salt; mix well. Stir in nuts. Drop dough by rounded teaspoonfuls 2 inches apart onto ungreased cookie sheets.