In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in egg. Combine flour and baking soda; gradually add to creamed mixture. Stir in bacon, cornflakes and raisins.
Drop by rounded tablespoonfuls 2 in. apart onto ungreased baking sheets. Bake at 350° for 15-18 minutes or until lightly browned. Cool for 2 minutes before removing to wire racks. Store in the refrigerator.