Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.

In a mixing bowl, combine cream cheese, granulated sugar, vanilla extract, lemon juice (if using), and egg yolk. Mix until smooth.

Unfold the puff pastry, cut into eight squares, and place on the baking sheet. Fold down edges to create a border and spoon filling in the center.

Whisk together one egg and a tablespoon of water for egg wash. Brush the edges of the puff pastry.

Bake for 15 to 18 minutes until puffed and golden brown.

Let cool for a few minutes before transferring to a wire rack.

Mix powdered sugar with milk or lemon juice for glaze, then drizzle over cooled pastries.