Beat butter, sugar and egg yolk together in a bowl.

Seive maida and baking powder.

Add the seived mixture into the butter mix along with cornflakes and vanilla essence.

Knead the mixture into a dough and keep in fridge for 10 - 15 mins.

Shape into balls and flatten with a fork.

Bake for 15 - 20 mins at 200 degrees.

Store in an air tight container.