Preheat the oven to 325°F (160°C). Line 2 baking sheets with parchment paper.
Sprinkle 1½ cups (300 G) sugar onto a clean surface, about 5 inches larger all around than the sheet of puff pastry.
Place the puff pastry over the sugar and sprinkle the remaining 1½ cups (300 G) sugar on top.
Gently press the sugar into the dough, then use a rolling pin to roll out the pastry to a 24 x 14-inch rectangle.
Using a knife or pizza cutter, cut the pastry into 9 equal squares.
Add the cream cheese to a piping bag fitted with a ¾-inch round tip.
Pipe the cream cheese diagonally onto the center of each pastry square.
Bring one corner of the dough diagonally over the cream cheese to meet the opposite corner, then roll up into a log. Divide the pastelitos between the prepared baking sheets, making sure the seams are on the bottom so the pastelitos do not unroll during baking.
Bake the pastelitos for 30–35 minutes, until golden brown and puffed. Remove from the oven and transfer to a plate to cool completely before serving.