Directions

1. Preheat the oven to 170-180°C
2. Melt the chocolate and butter in the microwave or with Bain-marie method
3. In a large bowl mix the butter and chocolate mixture with sugar, eggs (at room temperature), sieved flour, vanilla and the chopped hazelnuts.
4.Line a baking tray with parchment paper and bake for around 35/40 minutes.
4. Let it cool and then slice into squares.