Method
1. Add cornstarch, all purpose flour, baking powder and baking soda to a clean medium bowl
2. Whisk together until combined
3. Add unsalted butter and granulated sugar to a clean large mixing bowl
4. Cream together until light and fluffy
5. Add egg yolk, vanilla extract and brandy to the dough
6. Mix briefly
7. Add dry ingredients to dough gradually while mixing
8. Wrap with plastic wrap
9. Chill in fridge - 1 hr
10. Pre-heat oven - 175°C
11. Line 2 clean baking sheets with parchment paper
12. Roll out dough
13. Cut into rounds
14. Transfer dough to 2 baking sheets
15. Bake until browned at edges - 12 min, 175°C
16. Transfer onto cooling rack
17. Spread with dulce de leche
18. Dust with powdered sugar