Hamburger Stroganoff

1 pound ground beef, lean
1 small onion, chopped
1/2 teaspoon garlic salt
1/4 teaspoon pepper
1 can cream of mushroom soup, condensed
4 ounces mushroom stems and pieces, drained
3/4 cup sour cream, or yogurt

In medium skillet, brown ground beef and onion; drain excess fat. Stir in garlic salt, pepper, soup and mushrooms. Simmer covered, 15 to 20 minutes. Stir in sour cream; heat through, but do not boil. Serve over rice, noodles or chow mein noodles.