In a large bowl, add the shredded cooked chicken, the salt, the black pepper, the Alfredo sauce and mix everything very well until combined.
Now, in a 12-cup muffin pan, add the sheet of puff pastry.
Then, with another pan, press the pastry well and brush olive oil into each hole we've shaped.
To make the filling, add the grated mozzarella, distributed between these holes, and in each of them, add one tablespoon of the chicken mixture we prepared.
Then close everything with another 300g sheet of puff pastry.
Trim off any excess pastry with the help of a pastry cutter and cut it into square shapes.
Then, brush olive oil over everything, add the grated parmesan cheese and oregano to taste.
Finally, join the tips of these squares shaping them into muffins.
Take to a preheated oven at 180° C (350° F) and bake for 30 minutes.
Serve.