01 - Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
02 - Roll out the puff pastry on a lightly floured surface. Cut into 4 equal rectangles.
03 - Place pastry rectangles on the prepared baking sheet. Score a 1/2-inch border around each edge, ensuring not to slice through the dough.
04 - In a small bowl, thoroughly combine ricotta, honey, and vanilla extract until smooth.
05 - Spread the ricotta mixture evenly within the borders of each pastry rectangle.
06 - Layer apple slices over the ricotta, slightly overlapping. Mix granulated sugar with ground cinnamon, then sprinkle evenly atop the apple slices.
07 - Beat egg with milk in a small bowl. Brush the borders of each pastry rectangle with the egg wash.
08 - Bake for 22 to 25 minutes, or until the pastry is puffed and golden and apples are tender.
09 - Allow tarts to cool slightly. Drizzle with additional honey, then sprinkle toasted nuts or dust lightly with powdered sugar, if desired.
10 - Serve warm or at room temperature for best flavor and texture.