2 tbsp. freshly chopped parsley
2 tbsp. sour cream, plus more for serving
2 tbsp. cornstarch
1 tsp. Worcestershire sauce
2 tsp. dijon mustard
4 cups low-sodium beef or chicken broth
1 tbsp. tomato paste
2 tsp. fresh thyme leaves
2 cloves garlic, minced
1/2 large onion, chopped
1 pound baby Bella mushrooms, thinly sliced
2 tbsp. extra-virgin olive oil, divided
Freshly ground black pepper
Kosher salt
1 pound beef chuck roast, cut into 1" pieces
1 tbsp. vegetable oil
2 tbsp. butter
12 oz. egg noodles