Melt butter in a bowl
Grease square dish / line with parchment paper
Preheat oven to 180
Add sugar to melted butter and whisk well for 4-6 minutes
Add egg and vanilla extract. Mix until well combined
Sieve flour into butter mixture
Cut and fold until well combined
Add chocolate chip and walnuts. Gently fold mixture
Pour batter into prepared dish and level evenly
Bake for 23-35 minutes until done
Allow to cool for 30 minutes, Demould and cool completely on wire rack
Slice and serve. Tastes best when topped with Ice-cream and chocolate or caramel sauce
