1 Preheat oven to 200ºC/400ºF. Grease and line oven trays with baking paper.
2 Beat butter, extract, sugar and egg in a small bowl with an electric mixture untill light and fluffy.
3 Beat in sifted dry ingredients and buttermilk, in two batches, on low speed, until mixture is smooth.
4 Drop level tablespoons of mixture onto trays 4cm (1½ inches) apart. Bake about 8 minutes. Cool on trays.
5 Meanwhile, make butter cream filling. Join cooled pies with butter cream filling.
Butter cream filling Beat butter in a small bowl with electric mixer until as white as possible. Gradually beat in half the sifted icing sugar and the milk; beat in remaining sifted icing sugar.