Ghoulish avocado cupcakes - Australian Avocados

Ingredients

• ¼ cup apple cider vinegar
• ½ Hass avocado, flesh scooped out of the skin
• 70 g melted butter
• ½ cup milk
• 1 tbsp vanilla bean paste
• Finely grated rind and juice of ½ lemon
• 2 eggs
• ⅔ cup caster sugar
• 1½ cups plain flour
• 2 tbsp baking powder
• Black and white writing icing and icing eyes, to decorate
• 30 g softened butter
• 3½ cups icing sugar, sieved
• 1-2 drops green food colouring (optional)