In a mixing bowl, cream butter and icing sugar until light and fluffy. Stir in flour, cornstarch, baking powder and salt until very smooth. Form into a firm ball. Place on lightly floured surface. Lightly knead five or six times. Form level teaspoonfuls into small balls. Place two inches apart on unbuttered baking sheet. With fingertips or fork, gently press each ball to slightly flatten it. If desired, place a cherry piece in the centre of each. Bake in oven at 160ºC for about 15 minutes or until edges are slightly golden and firm to the touch. Cool. Makes five to six dozen. From The Gazette, 7. 0.41666666666667