Make the filling. To do this, boil rice (just a little). Fry chopped onions and carrots in a pan. Then add the mushrooms, seasonings, remove from heat, crumble the egg and mix everything.
Defrost the squid carcasses, remove the film from them, throw in boiling salted water for 2-3 minutes. Stuff the squids loosely with the prepared filling, secure with a toothpick, put in a baking dish.
Drizzle squid carcasses with mayonnaise and sprinkle with grated cheese on top. Bake the stuffed squid in an oven preheated to 200 degrees for about 10-15 minutes.
You can serve stuffed squid with a sauce that matches fish dishes.