Method
1. Pre-heat the oven to 175c/347F/gas mark 4
2. Cream the butter and sugar together for about 3 minutes until pale and fluffy
3. Add egg and whisk until combined
4. Add all purpose flour, cornflour and baking powder to the mixture
5. Fold lightly until completely mixed then set aside
6. Add vanilla extract and buttermilk and mix until just combined
7. Line a clean baking sheet with parchment paper
8. Pipe mixture into rounds with piping bag
9. Bake until light golden and let cool - 12 min, 175°C
10. Add single cream to a clean medium bowl and whisk until soft peaks form
11. Add icing sugar and whisk until well combined
12. Add mascarpone cheese and lemon juice and fold until well combined
13. Add lemon zest to the filling
14. Decorate each whoopie one by one with piping bag
15. Add raspberries and serve