Preheat oven to 350°F (180°C) fan with two baking trays lined with greaseproof paper.
Unroll puff pastry with baking paper underneath; lightly flatten wrinkles and dust with flour if sticky.
Use a large heart-shaped cookie cutter to cut shapes and place on trays.
Press a smaller heart cutter gently into the center of each large heart to create an indentation.
Mix cream cheese, flour, and sugar until thick and creamy; transfer to piping bag or use a spoon.
Pipe or spoon cream cheese filling into pastry hearts.
Add sliced fresh strawberries on top of the cream cheese filling.
Brush edges of pastry with dairy-free milk and sprinkle with extra sugar.
Bake in oven 10-15 minutes until golden and flaky. Repeat with second tray if needed.
Remove from oven, cool slightly, and dust with icing sugar before serving.