Brown the butter

• Melt the butter in a saucepan and keep cooking until it turns golden brown, being careful not to burn it.
• Let it cool, then add the granulated sugar and brown sugar and whisk until smooth.

Make the dough

• Mix in the egg and vanilla sugar until fully combined.
• Add the flour, baking soda and baking powder and mix just until no dry flour remains, without overmixing.
• Fold in the chopped chocolate.

Chill the dough

• Chill the dough in the fridge.

Bake the cookies

• Preheat the oven to 160 °C and line a baking tray with parchment paper.
• Scoop the dough into 6 portions and place them well spaced on the prepared tray.
• Bake on the middle rack with bottom heat only.

Cool and serve

• Let the cookies cool on the baking tray before serving.