Mix the minced meat with the egg and distribute it evenly in a dripping pan so that the mixture is approx. 1 cm thick.
Spread the mushrooms, olives, chopped tomatoes and the onion cut into rings on the mass. Mix the gypsy sauce with sour cream and distribute over the remaining ingredients. Place in the oven at 200 degrees for about 30 minutes.
Put the feta cheese cut into small cubes on the pizza and bake in the oven for another 15 minutes at the same temperature.