Heat oven to 375 degrees F. Beat margarine and sugars until fluffy. Beat in egg and vanilla. Add combined flour, baking soda, salt and spices; mix well. Stir in oats. Drop by rounded tablespoons onto ungreased cookie sheet. Bake 8 to 9 minutes for a chewy cookie, 10 to 11 minutes for a crisp cookie. Cool 1 minute on cookie sheet; remove to wire rack. Store tightly covered. Yields 4 1/2 dozen.