1/4 cup extra-virgin olive oil, divided
10 ounces white mushrooms, stems discarded and caps quartered
Kosher salt
Freshly ground black pepper
1 pound hanger steak, sliced across the grain 1-inch thick
1/4 cup all-purpose flour
1/3 cup dry red wine
1 tablespoon unsalted butter
1 small onion, thinly sliced
1 small garlic clove, minced
1 1/2 cups chicken stock or low-sodium broth
1 tablespoon Worcestershire sauce
1/2 cup sour cream
1 teaspoon chopped thyme leaves
1 tablespoon chopped flat-leaf parsley
Buttered fettuccine or egg noodles, for serving