Beat butter and brown sugar in large bowl with electric mixer on medium speed until creamy. Add egg and orange peel; beat until well blended. Add flour and baking powder; mix well. Gently stir in cereal. Drop tablespoonfuls of dough, 2 inches apart, on ungreased baking sheet. Bake at 350 degrees for 10-12 minutes or until lightly browned. Cool on baking sheet 2 minutes before removing to wire racks to cool completely.