Beef Stroganoff Soup

Name: Beef Stroganoff Soup
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: European, Eastern European
Ingredients: 5 tbsp. Butter, Divided; 1 lb. Beef Steak (Sirloin Is Great), Thinly Sliced (See Note); 1 Small Onion, Finely Chopped; 8 oz. weight Baby Portobello Mushrooms, Thinly Sliced; 2 tbsp. All-purpose Flour; 3 c. Beef Broth; 2 c. Heavy Cream; 1 tbsp. Worcestershire Sauce; Salt And Pepper, to taste; 6 oz. weight Egg Noodles; 1 c. Sour Cream; 1/4 c. Finely Chopped Parsley