Cut the fish into medium slices, salt and season to taste from all sides.
Roll in flour and fry in vegetable oil until golden brown.
Cut the mushrooms into slices, onion in half rings. Fry in vegetable oil until golden brown. At the end, salt and pepper a little.
Put the fish in a baking dish, put mushrooms with onions on top and bake in the oven at 200 degrees 15 minutes.
The fish with mushrooms and onions in the oven turns out to be very tasty and juicy, any fish is suitable for this dish, only with a minimum of bones, and preferably without them at all. Mushrooms will also suit any, but of course mushrooms are a priority. To prepare such a dish you will need very little time and effort. Fish is perfect for any side dish or as an independent dish.