Preheat Oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.

Prepare Puff Pastry: Unfold the thawed puff pastry on a lightly floured surface. Cut it into 6 equal rectangles. Place the rectangles on the prepared baking sheet.

Make the Filling: In a bowl, beat the cream cheese, granulated sugar, vanilla extract, and lemon juice until smooth and creamy.

Assemble the Danish: Spoon a dollop of the cream cheese mixture into the center of each puff pastry rectangle. Spread it slightly, leaving a 1/2-inch border around the edges.

Apply Egg Wash: Brush the edges of each rectangle with the beaten egg. This will help them turn golden brown during baking.

Bake: Bake in the preheated oven for 20-25 minutes, or until the puff pastry is golden and puffed.

Cool and Garnish: Allow the danishes to cool slightly, then dust with powdered sugar before serving.