yellow and orange food colouring pastes or gels
350g/12oz plain flour, plus extra for rolling
Β½ tsp baking powder
150²µ/5Β½΄Η³ϊ icing sugar, sifted
500g/1lb 2oz royal icing sugar
pinch salt
1 tsp vanilla bean paste
225g/8oz unsalted butter, at room temperature
1 free-range egg, lightly beaten