Brown the butter and melt the chocolate

• Melt the butter in a saucepan over medium heat until browned and nutty.
• Off the heat, stir the chopped chocolate into the warm butter until fully melted.

Mix in the sugars

• Add the brown sugar and granulated sugar.
• Stir until smooth.

Whisk in the eggs and vanilla

• Add the eggs and vanilla extract.
• Whisk until the mixture is thick and glossy.

Fold in the dry ingredients

• Sift the flour, cocoa powder, baking soda and salt into the bowl.
• Fold gently until just combined.

Add the chocolate chips

• Fold the chocolate chips into the batter.

Bake the brownies

• Pour the batter into a lined baking pan and spread evenly.
• Bake at 175 °C until the edges are set and the center is still slightly soft.

Cool and slice

• Let the brownies cool completely in the pan.
• Slice into squares for the fudgiest texture.