Raspberry Turnovers

pre-heat the oven to 400 unroll the puff pastry sheet and cut into 4 squares combine the berries, sugar, cornstarch, and vanilla heat over med until the berries begin to break down the sauce will begin to thicken quickly once thick {about 4 minutes} remove from the heat place 2 - 3 tbsp filling in the center of each square fold over into a triangle and press edges to seal brush the tops with a little milk and sprinkle with sparkling sugar {optional} bake for 20 minutes {the filling will oooze a little} cool on rack