PREHEAT oven to 350° F. Grease baking sheets.
COMBINE flour, oats, baking soda, cinnamon and salt in medium bowl. Beat butter, brown sugar and granulated sugar in large mixer bowl until light and fluffy. Add pumpkin, egg, and vanilla extract; mix well. Add flour mixture; mix well. Stir in nuts and raisins. Drop ¼ cup dough onto prepared baking sheet; spread into 3-inch circle or oval. Repeat with remaining dough.
BAKE for 14 to 16 minutes or until cookies are firm and lightly browned. Cool on baking sheets for 2 minutes; remove to wire racks to cool completely. Decorate with icings, morsels, candies, raisins and/or nuts.