fresh chopped parsley, Garnish
3/4 cup sour cream
1 tbsp. all-purpose flour
12 oz. wide egg noodles
2 tsp. Dijon mustard
2 tsp. Worcestershire sauce
1/4 cup dry white wine
3 cups low sodium or unsalted beef stock
4 oz. sliced mushrooms
2 cloves minced garlic
1 onion, peeled, chopped
2 tbsp. butter, divided
1/4 tsp. black pepper
1 tsp. kosher salt
1 1/2 pounds beef sirloin, cut into bite-sized cubes
1 tbsp. vegetable oil