Thaw the dough in the refrigerator. Wash the mushrooms and onions, peel and finely chop. Wash the garlic, peel it, pass it through a press. Beat the egg in a bowl using a blender. To serve, wash the dill, dry it on paper towels, and separate the branches from the stems. Line a baking sheet with parchment paper. Turn the oven on 180 degrees.
Make vol-au-vents. Roll out the dough thinly. Cut out circles with a diameter of about 5 cm, divide them into 2 equal parts. Make rings from one half. Brush large circles with egg and place on a baking sheet. Place the rings on top of the whole circles. Place in the preheated oven for 15 minutes, then cool.
Prepare the filling for the vol-au-vents. Pour oil into the pan, add onion and fry for 5-7 minutes. Add mushrooms and cook until liquid has evaporated. Add garlic, grated cheese, salt, pepper and heat for 2 minutes. Cool. Then put the filling into the prepared vol-au-vents.
Before serving, garnish the vol-au-vents with mushrooms with sprigs of fresh dill.