1-First Step: Preheat and Prep the Oven Preheat your oven to 400°F. Line a baking sheet with parchment paper to prevent sticking and ensure even browning. This high heat creates the signature flaky layers in the puff pastry tarts.

2-Second Step: Roll and Cut the Puff Pastry Thaw the puff pastry sheet according to package directions, usually 30-40 minutes at room temp. Roll it out on a lightly floured surface into a 12×9-inch rectangle for uniform pieces. Cut into 12 equal 3×3-inch squares using a sharp knife or pizza cutter. Trim edges for neat presentation if desired. Work quickly to keep the pastry cold, which helps it puff up beautifully.

3-Third Step: Prepare the Blueberry Filling In a small bowl, mix 1 cup fresh blueberries with 1/4 cup granulated sugar, 1 tbsp cornstarch, zest from 2 lemons, and 1 tbsp lemon juice. Gently toss to coat evenly. The cornstarch binds the juices during baking, creating a thickened compote-like filling that stays put. Let it sit for 5 minutes to macerate, releasing natural berry flavors. Taste and adjust sugar if your blueberries are very tart.

4-Fourth Step: Assemble the Tarts Place each pastry square on the prepared baking sheet. Spoon about 1-2 tablespoons of the blueberry mixture onto half of each square, leaving a 1/2-inch border to seal properly. Fold the empty half over the filling to form a triangle or rectangle. Press edges firmly with a fork to crimp and seal, preventing leaks. This step locks in moisture for juicy results.

5-Fifth Step: Egg Wash and Bake Beat 1 egg in a small bowl for the wash. Brush lightly over the tops of the assembled tarts, avoiding the edges to maintain puffing. Bake in the preheated oven for 15-18 minutes, or until golden brown and puffed. Rotate the sheet halfway for even cooking. Cool on a wire rack for at least 20 minutes; the filling sets as it cools, making filling easier.

6-Sixth Step: Make the Lemon Cream Filling While tarts cool, whip 1 cup heavy cream with 1/4 cup powdered sugar using a mixer on medium-high until stiff peaks form, about 2-3 minutes. In another bowl, beat 8 oz softened cream cheese with 1 tbsp lemon juice until smooth. Gently fold the whipped cream into the cream cheese mixture. Chill for 30 minutes; this firms it up for piping and enhances flavor. The tang from lemon cuts the richness perfectly.

7-Final Step: Fill, Garnish, and Serve Once tarts are fully cooled, slice a small vent on top if needed. Pipe or dollop the lemon cream generously using a piping bag or ziplock with corner snipped. Dust with extra powdered sugar for elegance. Serve immediately or chill briefly. Pair with coffee for brunch or ice cream for dessert. Pro tip: Chill cream 30 minutes for firmer texture and easier handling.