This sandwich can serve as a full breakfast and lunch.
Cut the mushrooms into slices, fry in a pan on both sides for 5-7 minutes.
In the meantime, beat the egg with flour, add salt to taste and pour into the pan to the mushrooms. We fry the omelet until ready. Sprinkle with grated cheese.
We cut the cucumber and tomatoes into thin slices.
Cut the omelet into the shape of a slice of bread and put on it. Put a layer of cucumbers and tomatoes on top. Add salad and cover with second slice of bread. The sandwich is ready, bon appetit!