Preheat the oven to 400℉. Line one large, rimmed baking sheet and one small baking sheet with parchment paper or silpat mats.
Lay each sheet of puff pastry onto a cutting board. Slice each piece of puff pastry into 12 equal squares (you could do fewer, depending on the size of your star cookie cutter). Place ½ of the squares equally spaced on your large baking sheet. Use a small star cookie cutter to cut the centers of the remaining ½ of the puff pastry squares (if you don't have a star, you can cut a circle or a square instead. Remove the stars to a separate small baking sheet. Spoon a tablespoon of jam into the center of each of the (uncut) squares on the baking sheet. Top each jam-filled square with one of the cut-out star squares. Use a fork to seal the edges of each square together (just press down to make a fork-mark along the edges). Sprinkle white, chunky sugar on top, if using.
Bake the pastries for 20 minutes, or until they are golden brown. Remove from the oven and let cool on the baking sheet.
ADD THE FILLING:
In a medium bowl, use an electric mixer to combine the cream cheese and sugar. Add the cream, and continue to beat until the mixture is smooth and creamy and thick enough for a piping bag.
Scoop the filling into a piping bag with a star tip and squeeze the filling into the center of each pastry. Garnish with fresh berries. Refrigerate for at least an hour, or until ready to serve.
Notes
If you don't have a piping bag, you can always scoop the filling into a zip baggie instead, cut the corner and squeeze the filling out of the corner to fill the pastries.
Change up the jam and fruit toppings as you wish.
Pastries will stay fresh in the refrigerator for up to 24 hours (keep in a covered container)