Afghan Biscuits - Kiwi Favourite - Bake with Amy

Ingredients

• 200 g butter, at room temperature
• ½ cup caster sugar
• 1 tsp vanilla extract
• 1 ¼ cups plain flour, sifted
• ¼ cup cocoa powder, sifted
• 1 ½ cups corn flakes
• 300 g icing sugar, sifted (around 2 1/2 cups icing sugar)
• 2 tbsp cocoa powder, sifted
• 1 ½ tsp melted butter
• 2 tbsp water (use less if you want a thicker, spreadable consistency)
• walnut pieces