In a bowl, put the cornstarch

The yolks

The sweetened condensed milk

And the butter or margarine

Mix it with your hands until it gets uniform

Roll a piece of the dough into 1 inch ball in the palm of your hand

Flatten with your wrist

Do it with all the dough and put it in the oven for approximately 20 minutes

When cooked, pick the chocolate and melt it in the microwave

You're going to dive half of the cookie in the melted chocolate

Place the cookies in a foil until the chocolate dry