100²µ/3½´Ç³ú plain flour
1 tsp baking powder
100²µ/3½´Ç³ú caster sugar
125²µ/4½´Ç³ú icing sugar, sifted
75²µ/2½´Ç³ú poppy seeds
½ tsp vanilla extract
150²µ/5½´Ç³ú butter, at room temperature, plus extra for greasing
75²µ/2½´Ç³ú butter, softened
3 free-range eggs, beaten