Preheat the oven to 400F/180C
Cut one sheet of premade puff pastry to 8 square pieces and place them on baking sheet covered with parchment paper.
Score the borders of the tarts ( 1,5-2 cm). Be careful that you don't cut too deep.
Whisk together the egg and 1 tbsp of water. Brush the borders of the tarts with the egg wash.
Bake for about 20 minutes at 400F/180 C until the tarts get the golden color. Set aside to cool.
Whip the heavy cream. Beat the cream cheese and sugar together. Add lemon juice.
Gently fold the cream cheese with the whipped heavy cream.
Make another cut with the knife on the borders of puff pastry tarts in the same place where you already scored them. Gently push the centre of the tarts down to make space for the filling.
Cut the fruit to pieces to fit the tarts if needed.
Top the tarts with cream cheese filling and add fruit pieces.
Enjoy!