In a bowl add the cornstarch, butter, egg, sugar and condensed milk mix well until it forms a dough.
Knead the dough well.
Let the dough rest in the fridge for 20 minutes.
Preheat the oven to 200°C
Grease the form with butter
Remove the dough from the refrigerator and divide into three parts.
Take a portion of the dough and cut 1 cm thick rolls and shape into a cookie shape or use a cookie cutter.
Place the cookies in the form and repeat the same process with the rest of the dough.
Bake in the oven for 20 minutes or until the cookies are lightly golden.
remove from oven