Easy Beef Stroganoff
["1 1/2 pounds sirloin steak", "1 pint sour cream", "1 package stroganoff seasoning mix", "1 small can mushrooms (optional)"]
["Cut steak into small strips.", "Brown lightly in a large frying pan.", "Stir in sour cream and stroganoff seasoning mix.", "Continue stirring over medium heat until mixture is warm or hot.", "Serve over rice with a favorite vegetable or salad."]
["sour cream", "mushrooms"]