Preheat the oven to 350 F and line a baking sheet with parchment paper.
Cut each sheet of thawed puff pastry into 4 squares. Place 4 squares on each of the parchment paper-lined baking sheets.
Use a sharp knife to make a cut ½-inch from the edge of the squares in each corner like in the image below.
Place a pineapple slice in the center of each square and fold the corners towards the center of the pineapple to meet in the center of each pineapple round, like the images below.
Place a raspberry in the center of each puff pastry, brush with egg wash, and bake until golden brown, about 18-20 minutes. Let them cool down for a few minutes and dust them with powdered sugar before serving.