Preheat oven to 400 degrees. Line a baking sheet with parchment paper or a silicone baking sheet.
On a lightly floured surface roll out thawed puff pastry into a 12x9" rectangle. Cut in half lengthwise, yielding 2 4-½" strips. Cut those two strips crosswise into thirds, to yield six 4x4 ½" pieces.
With a knife, score ½" border around the edge of each piece of puff pastry. Use a fork to make five or six pricks into the dough within the border of each piece. This will help keep the middle of each piece from rising.