Cream the butter and sugars

• Beat the softened butter with the brown sugar and granulated sugar until light and fluffy.
• Beat in the egg and vanilla extract until smooth.

Make the dough

• Whisk the flour, baking soda and salt together in a separate bowl.
• Add the dry ingredients to the wet mixture and stir until just combined.
• Fold in the chocolate chips.

Chill the dough

• Cover the dough and refrigerate so the cookies spread less in the oven.

Shape and bake

• Preheat the oven to 180 °C and line a baking tray.
• Scoop balls of dough onto the tray, leaving space between them.
• Bake until the edges are golden and the centres still soft.

Cool

• Let the cookies rest on the tray for a few minutes, then transfer to a rack to cool.