Heat oil in a pan. Add the minced meat and fry constantly stirring until brown.
Add chopped onion to the sautéed minced meat. Mix and cook for 2 minutes over medum heat until the onions soften.
Cut the zucchini into a small cube, add to the pan. Mix, cover and simmer for 4-5 minutes.
Drain the excess liquid from the pan, salt, pepper and mix everything.
Preheat the oven to 350 degrees F. Grease the baking dish with oil and line it with one sheet of dough. You can roll out the dough a little wider than your shape and make small sides. So the casserole will keep in shape.
Bake the dough in the oven for about 7 minutes. Then put a mixture of minced meat and vegetables on top of the dough.
Grate mozzarella and sprinkle on top.
Put the second layer of dough on the casserole, cover with a sheet of foil and bake in the oven for 35-40 minutes. 10 minutes before the end of cooking, remove the foil so that the crust can brown.
