Beef Stroganoff

1 lb round steak, diced
2 tbsp butter, margarine, or oil
1 onion, diced
1 can cream of mushroom soup
1 cup chopped mushrooms
dash of salt, pepper, and garlic powder
1 tbsp Worcestershire Sauce
1 cup sour cream

Brown meat and onion in oil. Add soup, mushrooms, spices, and Worcestershire sauce. Cook till tender. Add sour cream just before serving. Serve over cooked rice or noodles.