1. Preheat the oven to 180°C (350°F). Line a cast iron skillet (24cm)* or a similarly sized rectangular/round cake pan with parchment paper or grease lightly and set aside.

2. Melt the butter and chocolate together – either in the microwave or in a heatproof bowl over a pot of simmering water. Whichever method you use, the chocolate should melt as slowly as possible. Set aside and let cool slightly.

3. Mix the eggs and sugar in a large bowl until light and fluffy – this can take about 4-5 minutes. Add the vanilla extract and mix well. Add the flour, salt, and melted chocolate mixture and mix until just combined. Fold in the chocolate chips. Transfer the batter to the prepared cast iron skillet or cake pan and smooth out the top.

4. Bake the brownies in the preheated oven for about 20-24 minutes, or until a toothpick inserted into the brownies comes out (almost) clean. Take the brownies out of the oven and let them cool down. Dust with some confectioners‘ sugar before serving if you like.