Brown the butter

• Melt the butter in a saucepan over medium heat.
• Keep cooking until it turns golden brown and smells nutty, then let it cool slightly.

Mix the sugars and wet ingredients

• Whisk the brown sugar and white sugar into the browned butter.
• Beat in the egg and the vanilla extract until smooth.

Add the dry ingredients

• Mix the flour, baking soda and salt together.
• Fold them into the wet mixture softly and delicately, just until combined.

Fold in the chocolate

• Fold the chopped dark chocolate into the dough.

Shape and bake

• Preheat the oven to 180 °C and line a baking tray.
• Scoop balls of dough onto the tray, spacing them apart.
• Bake until the edges are set and the centers are still soft.

Cool and serve

• Let the cookies cool on the tray for a few minutes before eating.