Mix the wet ingredients

• Whisk the melted butter with the light brown sugar and granulated sugar until smooth.
• Beat in the egg and vanilla extract until fully combined.

Add the dry ingredients

• Add the plain flour, bicarbonate of soda and salt.
• Fold together with a spatula until no dry flour remains.

Add the chocolate chips

• Fold in the chocolate chips until evenly distributed.
• Add any extra mix-ins you like at this point.

Chill the dough

• Cover the bowl and chill the dough in the fridge.

Shape the cookies

• Roll the chilled dough into balls of equal size.
• Place them on a baking tray lined with baking paper, spaced apart.

Bake

• Bake at 160 °C fan until the edges are golden but the centres still look puffy and soft.

Cool on the tray

• Leave the cookies on the baking tray to cool; they will flatten and crinkle as they cool.
• Only move them once they have set.