01 - Preheat the oven to 400°F. Line two baking sheets with parchment paper.
02 - Place the puff pastry sheets onto the prepared baking sheets. Prick the dough all over with a fork to prevent excessive puffing during baking. Lay a second sheet of parchment over each pastry sheet, then place another baking sheet on top to weigh them down.
03 - Bake for 15 to 18 minutes until the pastry turns golden brown and crisp. Remove the top baking sheet and parchment layer. Allow the pastry to cool completely on the pan.
04 - While the pastry cools, combine the ricotta cheese, powdered sugar, lemon zest, lemon juice, and vanilla extract in a medium mixing bowl. Whisk until the mixture is smooth and creamy.
05 - In a separate bowl, whip the heavy cream until soft peaks form. Gently fold the whipped cream into the lemon ricotta mixture in two additions, being careful not to deflate it. Refrigerate until ready to assemble.
06 - Once the pastry sheets are completely cool, carefully trim the edges with a sharp knife. Cut each sheet into 3 equal rectangles, yielding 6 pastry pieces total.
07 - Place one pastry rectangle on a serving plate. Spread one-third of the lemon ricotta filling evenly over the surface using an offset spatula. Add a second pastry rectangle and spread another third of the filling. Finish with the third pastry rectangle on top.
08 - Dust the top layer lightly with powdered sugar. Garnish with lemon zest curls if desired. Refrigerate for at least 30 minutes before slicing to allow the layers to set. Serve chilled.