Preheat the oven to 400F.

Roll out the puff pastry, and cut into 4 even squares.

Place half a tablespoon of strawberry jam in the center of each square. Moisten the edges, then fold the pastry in half and press around the edge using your fingertips.

Transfer to a pan lined with parchment or a silicone liner, and bake for 20 minutes, until golden brown and puffy.

Let cool slightly, then sprinkle with powdered sugar and enjoy!