Preheat the oven to 180°C and line a 30 x 23 x 5 cm oven proof dish.
In a large sauce pan melt the butter and the chocolate together.
In a bowl lightly beat the eggs, sugar and vanilla together.
Once the chocolate mixture has melted, remove it from the heat and allow to cool for about 5 minutes and then beat in the egg mixture once combined add the flour, salt and chopped nuts.
Make sure it is all combined well and then scrape the mixture into your lined dish.
Bake for about 35 minutes.
The top will be a paler colour compared to the inside of the brownies. Remove from the oven and allow to cool.
Once cool cut into squares.