01 - Preheat the oven to 400°F. Line a baking tray with parchment paper.
02 - Roll out the puff pastry on a lightly floured surface. Cut into 12 equal rectangles. Place on the prepared tray, sprinkle with granulated sugar, and cover with another sheet of parchment paper topped with a second baking tray to prevent excessive puffing.
03 - Bake for 15 to 20 minutes until crisp and golden brown. Transfer to a wire rack and let cool completely.
04 - In a mixing bowl, whisk the ricotta until smooth. Add powdered sugar, lemon zest, lemon juice, and vanilla extract. Mix until well combined.
05 - In a separate bowl, whip the heavy cream to stiff peaks. Gently fold the whipped cream into the ricotta mixture until fully incorporated. Refrigerate until ready to assemble.
06 - Spread or pipe a generous layer of lemon ricotta cream onto six of the pastry rectangles. Top each with a second pastry rectangle to form the mille feuille.
07 - Dust the top layer of each mille feuille with powdered sugar and garnish with additional lemon zest. Serve immediately for the best texture.