You can also service this with rice (I use instant). I've used both and it's good!

1/2 pound fresh mushrooms (any variety); sliced 1 large sweet onion; sliced 2 teaspoons vegetable oil 2-4 1 pound beef sirloin steaks; thinly sliced 1 can cream of mushroom soup 3/4 cup milk 2 heaping tablespoons Dijon mustard hot, cooked, egg noodles

In a large skillet saute the mushrooms & onion in the oil over medium high heat. Cook until just tender. Remove & set aside. In the same skillet cook the beef steaks until no longer pink. Add the soup, milk, mustard. Return the onions & mushrooms. Reduce heat, cook & stir until sauce is thinckened. Servce over hot, cooked, noodles.