01 -
Thaw puff pastry 15-20 minutes. Heat oven to 400°F. Line baking sheet with parchment. Beat egg with water.
02 -
Toss sliced peaches with sugar, salt, cinnamon, and cornstarch until evenly coated.
03 -
Place pastry on baking sheet. Arrange peaches in 3 rows leaving 1-inch border. Add blueberries. Brush pastry edges with egg wash.
04 -
Bake 16-18 minutes, rotating once, until crust is golden and fruit tender.
05 -
Whisk confectioners' sugar, vanilla, and cream until smooth. Drizzle over warm tart before serving.