Preheat your oven to 180°C / 350-375°F / Gas Mark 4-5
Line 2 flat baking trays with grease proof paper
Add the butter to a mixing bowl and beat till soft and fluffy Note 1
Gently pour the sugar into the butter and continue to beat (until combined).
Add vanilla essence, followed by self - raising flour.
Use a spoon to stir the ingredients together
Transfer cornflakes into a zip lock bag, seal and use a spoon to bang the bag to slightly crush the cornflakes Note 5
Use a soup spoon to portion out individual amounts of the batter and roll this into a cookie shape using the palms of your hands.
Drop the rolled cookie into the cornflakes and shake the pan, to allow the cornflakes to stick to the other side. Note 6
Lay each cookie flat on the baking tray slightly spread apart from each other Note 7
Place the baking trays into the oven one by one (middle and lower racks)
Bake the biscuits for 16 mins until slightly golden brown Note 8
Use oven mits to remove the biscuits from the oven and allow to cool on a wire rack.