01 -
Pat chicken breasts dry, season both sides generously with salt and pepper. Heat olive oil in a skillet over medium-high heat and sear chicken until golden on both sides. Remove and allow to cool completely.
02 -
In the same skillet, melt butter. Add mushrooms, shallot, and garlic. Cook, stirring frequently, until all moisture evaporates and the mixture forms a paste. Cool thoroughly.
03 -
On a sheet of plastic wrap, layer prosciutto slices slightly overlapping. Evenly spread mushroom mixture over prosciutto, then place cooled chicken in the center. Roll tightly, using the wrap to compress. Chill 15–20 minutes.
04 -
Unroll puff pastry on a floured surface. Place wrapped chicken in the center, fold pastry over, and seal edges. Place seam-side down and chill for 10 minutes.
05 -
In a small bowl, whisk egg yolk with water. Brush the pastry top with egg wash and cut small vents to release steam during baking.
06 -
Transfer to a baking sheet and bake at 400°F (200°C) for 25–30 minutes until pastry is deep golden brown. Rest for 5 minutes before slicing.