Kartofelniki, zrazi with Meat and Mushrooms

I made them before, and we love this dish. This time I change the filling a little bit and we like it a lot! Also, we like them wish mushroom sauce.

The filling: fried onion (3-5 min), carrot (3-5 min), mushrooms, (4 min), 2 tbs butter, garlic, fried 400g meat, dill, parsley or basil. For the potatoes: 1 kg potatoes, 1 egg, 3-4 tbsp flour, salt, pepper, dry herbs. Serve with sour cream.