Peanut butter & Chocolate Cookie Monster - Sarah J Thomas

Ingredients

• 375g plain flour
• 2 teaspoons cornflour
• 1 teaspoon baking powder
• ½ teaspoon bicarbonate of soda
• 1 teaspoon salt
• 250g unsalted butter
• 200g light brown sugar
• 100g granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract
• 300g milk chocolate chips and a handful to decorate
• 150g smooth peanut butter
• 500g icing sugar
• 50g cocoa powder
• 2-4 tablespoons milk