Begin by preheating your oven to 400°F (200°C). While the oven heats up, prepare a baking sheet by lining it with parchment paper for easy cleanup.
On a lightly floured work surface, gently roll out the thawed puff pastry sheet until smooth. With a sharp knife or pizza cutter, cut the pastry into four equal squares.
In a medium mixing bowl, combine the softened cream cheese, powdered sugar, and vanilla extract. Use a hand mixer or a whisk to blend the mixture until it becomes smooth and creamy, ensuring there are no lumps.
In a separate bowl, tastefully toss the sliced strawberries with fresh lemon juice and a sprinkle of powdered sugar (optional, based on your sweetness preference) to enhance their flavor and keep them fresh.
Take each puff pastry square and place a generous dollop (about a tablespoon) of the cream cheese filling in the center.
Carefully layer a few strawberry slices over the cream cheese filling, allowing their vibrant color and freshness to shine through.
Gently fold each corner of the pastry squares towards the center, forming a beautiful diamond shape. Pinch the corners together firmly to ensure they are sealed without any filling escaping during baking.
Brush the tops of the shaped pastries with the beaten egg, which will give them a lovely golden-brown finish as they bake.
Place the prepared danishes in the preheated oven and bake for approximately 15-20 minutes, or until they are puffed up and beautifully golden. Keep an eye on them to avoid over-browning.
Once the danishes are done baking, remove them from the oven and allow them to cool slightly on a wire rack. Before serving, feel free to dust them with additional powdered sugar for an elegant touch.
Notes
For an impressive display, serve the danishes warm on a decorative platter, garnished with fresh mint leaves and additional sliced strawberries.