Step 1

Grease and line an 8-inch square pan with baking or parchment paper, ensuring two sides overhang.Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced.

Step 2

In a large mixing bowl, cream butter and sugar with an electric beater or until pale and creamy. Add vanilla, egg and egg yolk and beat again until combined.

Step 3

Sift in flour and baking powder and beat until a soft dough forms. Add chocolate chips and hand cut chocolate and beat again.

Step 4

Place dough in prepared pan and spread into one even layer. Sprinkle extra chocolate chips on top.

Step 5

Pop into the oven for approximately 30 minutes or until golden brown on top. Leave to cool completely in the tin before removing. Cut into slices and serve.