Savory French Onion and Beef Casserole (Cozy and Cheesy)

Ingredients

• 10 oz (285 g) wide egg noodles
• 1 tablespoon olive oil
• 1 1/2 lb (680 g) ground beef, 85 percent lean
• 2 medium yellow onions, thinly sliced
• 8 oz (225 g) cremini mushrooms, sliced
• 3 cloves garlic, minced
• 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
• 1 teaspoon Worcestershire sauce
• 1 can (10.5 oz / 298 g) condensed French onion soup
• 3/4 cup (180 ml) beef broth
• 3/4 cup (180 g) sour cream
• 1/2 teaspoon kosher salt, plus more for pasta water
• 1/2 teaspoon black pepper
• 1 1/2 cups (170 g) shredded Swiss cheese or Gruyere
• 1 cup (40 g) crispy fried onions
• 2 tablespoons chopped fresh parsley, optional