01 -
Take the frozen puff pastry out and let it soften at room temperature for 15-20 minutes. It should be flexible for folding but not overly soft.
02 -
Heat your oven to 400°F (200°C). Get a baking sheet ready by covering it with parchment paper.
03 -
Stir together the water and egg in a small dish until it's smooth and all blended.
04 -
Combine peach slices, sweetener, cinnamon, salt, and cornstarch in a big bowl. Mix until everything is evenly coated.
05 -
Carefully unfold the softened sheet of pastry onto the parchment-lined baking sheet. Smooth out any cracks with damp fingers, pressing them together gently.
06 -
Spread the peaches in three neat rows, leaving about an inch (2.5 cm) of empty border around the edges. Scatter blueberries over the peaches so they’re evenly distributed.
07 -
Use a pastry brush to coat the exposed edges of the puff pastry with the egg mixture.
08 -
Bake for 16 to 18 minutes, turning the pan halfway through, until the crust is golden and flaky, and the peaches are tender.
09 -
While the tart cooks, make the glaze by whisking powdered sugar with vanilla and cream. Adjust consistency by adding more cream if necessary.
10 -
Pour the finished glaze on the tart while it’s warm. You could pair it with vanilla ice cream for an extra treat.