Here’s a show-stopping dish for those extra special occasions.
Preheat oven to 425°F.
Cook first 5 ingredients in a sauté pan over medium heat until all liquid is absorbed and mixture resembles a paste.
Season steaks with salt and pepper on both sides. Cover top of the steaks with mushroom mixture.
Cover the steaks with puff pastry to form square like pockets. Seal ends tightly and brush top of pastry dough with egg wash.
Bake on a rack uncovered for 25 minutes. Serve.