Method
1. Pre-heat oven - 175°C / 350°F
2. Add hazelnuts to the baking sheet and bake until toasted - 5 min, 175°C / 350°F
3. Let cool - 10 min
4. Wrap with kitchen towel
5. Grind a clean small bowl and set aside
6. Add unsalted butter and brown sugar to a clean stand mixer bowl
7. Cream together until light and fluffy
8. Add egg yolk and vanilla extract
9. Mix well
10. Add all purpose flour, baking powder and salt to a clean large mixing bowl and mix together
11. Transfer hazelnuts and dry ingredients to the stand mixer bowl and mix until dough forms
12. Divide into halves and wrap with plastic wrap
13. Chill in fridge - 1 hr
14. Pre-heat oven - 175°C / 350°F
15. Prepare a clean baking sheet
16. Roll dough until 1/8" (5mm) thick
17. Cut out
18. Transfer dough to baking sheet
19. Bake until golden brown - 8 min, 175°C / 350°F
20. Transfer onto cooling rack
21. Spread with hazelnut chocolate spread