Get the Pesto HERE!
Preheat your oven to 400 degrees. Line a baking sheet with parchment paper.
On a lightly floured surface, roll both puff pastry sheets out slightly until the folds are no longer visible.
Spread the pesto on one sheet, leaving a 1/2 inch border all around.
Top with the prosciutto and then cover with the other sheet of puff pastry, pressing to seal the edges.
Cut into 18-20 1/2 inch thick strips.
Twist twice and place each twist on the parchment lined pan.
Brush with egg wash and sprinkle with the grated Parmigiano Reggiano cheese.
Bake for 15 minutes or until golden.