In a mixing bowl, on medium speed (or by hand), beat margarine with brown sugar until creamy. Add egg and vanilla extract and beat until light and fluffy. Mix in flour, baking soda, pumpkin pie spice and salt.
Roll rounded teaspoonfuls of dough into powdered sugar. Place on baking sheet (spacing is'nt really important, but about an inch or two apart is good). Bake until golden, about 7 to 8 minutes. Makes 1 cookie per serving.