Preparing the Blueberry Filling

1. Combine Ingredients: In a small saucepan, add the blueberries, granulated sugar, lemon juice, and 3 tablespoons of water. Stir well to combine.
2. Cook the Mixture: Place the saucepan over low to medium heat, stirring occasionally to prevent sticking. Allow the mixture to come to a gentle boil, which should take about 4-5 minutes.
3. Thicken the Filling: In a separate small bowl, mix the remaining 4 tablespoons of water with the cornstarch, stirring until the cornstarch is fully dissolved. Pour this cornstarch mixture into the saucepan with the blueberry mixture and stir continuously until it thickens, usually within a couple of minutes. Once thickened, remove from heat and let cool to room temperature.

Preparing the Cream Cheese Filling

1. Beat the Cream Cheese: In a mixing bowl, beat the cream cheese with an electric mixer until it is smooth and creamy, about 2 minutes.
2. Add Remaining Ingredients: Add the sugar, lemon juice, and vanilla extract to the cream cheese. Continue to beat until the ingredients are fully combined and the mixture is smooth. Set aside.

Baking the Puff Pastry Shells

1. Prepare the Pastries: Follow the package directions for baking the puff pastry shells. Most puff pastries require a preheated oven and will bake until golden brown, usually around 15-20 minutes. Be sure to leave adequate space between each pastry as they will puff up while baking.
2. Cool and Prepare for Filling: Once baked, carefully remove the pastries from the oven and allow them to cool for a few minutes. Using a small knife, remove the “top” or center of each pastry shell, creating a well for the fillings.

Assembling the Pastries

1. Layer the Fillings: Begin by adding a spoonful of the cream cheese mixture to the center of each pastry shell. Spread slightly to ensure an even layer.
2. Add Blueberry Filling: Next, add a spoonful of the cooled blueberry filling on top of the cream cheese layer. For an added visual touch, you can swirl a small dab of the cream cheese mixture on top of the blueberries for a decorative effect.
3. Top with Fresh Blueberries: Garnish with a few fresh blueberries on top for a burst of color and extra freshness.
4. Serve and Enjoy: These pastries are best enjoyed fresh and warm, but they also taste delicious at room temperature. Serve with a dusting of powdered sugar if desired.