Step 1

Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced. Line two baking trays with baking or parchment paper.

Step 2

In a large mixing bowl, add cold butter and sugar. Beat with an electric mixer until combined. Add vanilla and egg. Beat again until combined – but try not to over mix.

Step 3

Add flour, cornflour, baking soda and salt, if using, and beat on a low speed until soft cookie dough forms. Add chocolate and walnuts and beat briefly.

Step 4

Scoop out cookie dough***, roughly 2 tablespoons per cookie, and place on prepared oven trays, leaving room for the cookie to spread.

Step 5

Bake cookies for 12-14 minutes or until golden brown. Leave cookies to cool completely.