Step 1: Make the Strawberry Filling

1. In a small saucepan over medium heat, combine strawberries, sugar, and lemon juice.
2. Cook for 3-4 minutes, stirring occasionally, until strawberries soften and release juice.
3. In a small bowl, mix cornstarch and water, then stir into the strawberry mixture.
4. Cook for 1-2 more minutes, until thickened. Remove from heat and let cool.

Step 2: Prepare the Cream Cheese Filling

1. In a bowl, beat cream cheese, powdered sugar, vanilla extract, and egg yolk until smooth.

Step 3: Shape the Puff Pastry Hearts

1. Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Roll out the puff pastry and cut out heart shapes using a cookie cutter.
3. Place half of the hearts on the baking sheet.
4. Use a smaller heart-shaped cutter to cut out the centers of the remaining hearts, creating a heart border.
5. Place the bordered hearts on top of the full hearts to create a raised edge. Press lightly to seal.

Step 4: Fill the Danishes

1. Brush the edges with egg wash (whisked egg and milk).
2. Spoon 1 teaspoon cream cheese mixture into each heart and spread evenly.
3. Add 1 teaspoon strawberry filling on top.

Step 5: Bake & Glaze

1. Bake for 15-18 minutes, or until golden brown and puffed.
2. Let cool slightly before drizzling with vanilla glaze (whisk powdered sugar, milk, and vanilla together).