Instant Pot Beef Stroganoff

Name: Instant Pot Beef Stroganoff
Ingredients: 2 pounds boneless beef short ribs, slice into 1-inch stew chunks; Kosher salt and black pepper, to taste; 1 tablespoon neutral oil; 3 tablespoons unsalted butter, divided; 1 large yellow onion, diced (1 cup); 6 garlic cloves, minced; 3 tablespoons tomato paste; 1 tablespoon sweet paprika; 2 8-ounce containers mushrooms like baby bella, crimini, or button, sliced; 2 tablespoons Worcestershire sauce; 1 tablespoon fish sauce; 2 cups beef broth; 12 ounces package of egg noodles; 1 cup sour cream, room temperature; 2 tablespoons all-purpose flour; 2 tablespoons cornstarch; 1/2 cup fresh parsley, minced