In a bowl, combine the cream cheese and granulated white sugar. Mix until well combined. Set it aside.
In another bowl, combine the blueberries, lemon juice, and brown sugar. Mix well and set aside.
Heat the oven to 400F.
Roll out the puff pastry and cut each sheet into four pieces, transferring them to a parchment lined sheet pan.
Using a paring knife, lightly score a border inside of each puff pastry, without cutting through it. Then dock the inside with a fork.
To the middle of each puff pastry, add approximately a tablespoon of the cream cheese mixture.
Spread the cream cheese mixture up to the scored border.
Add a tablespoon of blueberry jam on top of the cream cheese and spread over top.
Add the blueberries on top and brush the edges of each puff pastry with milk.
Bake for 18 minutes or until the puff pastry is golden. Allow the pastry to cool for 5 minutes before serving warm.