01 -
Puree the blackberries until smooth, then press through a fine-mesh sieve. Simmer the strained puree over medium heat until reduced to about 1/2 cup, 12-18 minutes. Cool for 5 minutes.
02 -
Whisk the reduced puree, sugar, egg, egg yolks, and lemon juice in a saucepan over medium-low heat. Cook, whisking constantly, until thick enough to coat a spoon, 5-7 minutes. Remove from heat, whisk in butter, then strain and cool.
03 -
Beat the softened cream cheese, sugar, egg yolk, vanilla, and salt until smooth and creamy. Keep chilled until the pastry is ready.
04 -
Heat the oven to 400°F (200°C). Line two baking sheets with parchment. Roll the puff pastry lightly, then cut into 12 equal squares or rounds. Score a 1/2-inch border and prick the centers with a fork.
05 -
Spoon about 1 tablespoon cream cheese filling into each center. Brush the borders with egg wash and sprinkle with turbinado sugar. Bake for 15-18 minutes, rotating the pans once, until puffed and golden.
06 -
Cool the pastries for at least 15 minutes. Spoon blackberry curd into the centers, add fresh blackberries, and dust lightly with powdered sugar before serving.