Preheat oven to 375F.
Start by baking the puff pastry per package instructions until golden and crispy. If not already cut, cut into squares then bake
Once the puff pastry has cooled, break it into small pieces and place it on a plate.
Meanwhile mix together the milk, cornflour, and sugar then place on medium heat and cook until just boiling (stirring frequently). Remove after a few seconds of boiling.
In a Oven safe bowl add puff pastry and nuts.
Pour the hot milk mixture over the bowl spreading evenly.
Spread the dry milk mixture over the surface.
Bake in the oven for approximately 10-15 minutes until the surface is golden brown.
Serve immediately, with nuts on the side for topping.