Sprinkle the steak strips with salt and pepper to lightly cover them, and then dust with flour. In a large skillet, quickly brown them on both sides in the olive oil and butter. Remove the steak from the pan.
Add the onion slices,diced potatoe and mushrooms to the pan drippings. Saute for a few minutes, until the onion is tender. Sprinkle with 2teaspoon flour.
Put the steak back into the pan with the onions,potatoes and mushrooms. Add the mushroom soup and beef broth. Cook over low heat for about 30 minutes, covered. Adjust seasoning to taste, adding salt and pepper, as needed.
Stir in the sour cream the last few minutes, right before you serve. Serve over cooked noodles. Serve with it a salad and hot bread.Enjoy!!!!!