Classic Beef Stroganoff with Mushrooms and Creamy Sauce

Ingredients
1 lb beef sirloin or tenderloin, thinly sliced

1 tablespoon olive oil

1 onion, finely chopped

2 cloves garlic, minced

8 oz mushrooms, sliced

1 cup beef broth

1 cup sour cream

1 tablespoon Dijon mustard

Salt and pepper, to taste

Fresh parsley, chopped (for garnish)

Cooked egg noodles or rice (for serving)

Instructions