After washing, break the chicken eggs into a bowl.
Mix the whites and yolks until smooth.
Slice the mushrooms.
Cut the dough into equal-sized squares. Place the mushroom filling on them.
Form the dough into envelopes, sealing the edges with a fork. Sprinkle with a little flour.
Lightly brush the resulting envelopes with the egg mixture.
Bake the mushroom puff pastries for 10-15 minutes in an oven preheated to 180 °C.
Let the puff pastries cool slightly before serving.