Cut the onion into fine cubes. Mix the meat with the egg and the onion cubes well and place in a large greased baking dish and press firmly. Spread the glass of gypsy sauce over the mince. Drain the mushroom slices and spread over them as well. Sprinkle the grated cheese on top. The imagination knows no limits. If you like, you can also add fresh peppers in strips or corn, or, or.
Covered with aluminum foil for approx. 30 minutes at 180 ° C, bake without foil for 15 minutes so that the cheese browns.