Creating these stunning bundles is as easy as following these steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
2. Prepare the Asparagus: Rinse asparagus spears and trim off tough ends. Place on a baking sheet and drizzle with olive oil and a pinch of black pepper.
3. Roast the Asparagus: Roast the asparagus in the preheated oven for about 10 minutes until slightly tender but still crisp. Remove and let cool slightly.
4. Roll Out Puff Pastry: Dust your work surface with flour. Roll out the puff pastry sheets to smooth any creases.
5. Cut the Pastry: Cut each puff pastry sheet into squares, about 4×4 inches in size.
6. Assemble the Bundles: Place a slice of prosciutto in the center of each pastry square. Add one asparagus spear on top of the prosciutto.
7. Fold the Pastry: Fold the pastry corners over the asparagus and prosciutto, pinching them together to create a bundle.
8. Apply Egg Wash: Brush the tops of the bundles with the beaten egg for a nice golden color.
9. Sprinkle Cheese: If using, sprinkle grated Parmesan cheese on top of each bundle.
10. Bake: Place the bundles on the lined baking sheet and bake for 15-20 minutes, or until golden brown and flaky.
11. Cool Slightly: Once done, remove from the oven and allow to cool for a few minutes before plating.

These easy-to-follow steps will guide you in creating these incredible bundles that are as delicious as they are impressive.