Heat oven to 350 degrees F Cream margarine and sugar until light and fluffy. Blend in egg. Add flour and soda to creamed mixture; mix well. Stir in Bran flakes, cheese and raisins. Drop by rounded tablespoonfuls of dough onto greased cookie sheet, 2 inches apart. Bake at 350 F 12 -15 minutes, or until lightly browned.
Makes about 2 1/2 dozen.