Creating the Creamy French Onion Chicken Pasta Bake is simpler than you might think. Follow these steps to bring this delightful dish to life:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and prepare a 9×13-inch baking dish by greasing it lightly.

2. Cook the Pasta: Bring a large pot of salted water to a boil. Add the pasta and cook until al dente, according to package instructions. Drain and set aside.

3. Sauté the Onions: In a large skillet, heat olive oil over medium heat. Add the sliced onions and cook slowly, stirring occasionally, until they are caramelized and golden brown (about 15-20 minutes). Add minced garlic and continue to sauté for 1-2 minutes until fragrant.

4. Cook the Chicken: Add the diced chicken to the skillet. Season with salt, pepper, and Worcestershire sauce. Cook until the chicken is no longer pink, approximately 5-7 minutes.

5. Combine Ingredients: In a large mixing bowl, combine the cooked pasta, caramelized onions, chicken mixture, sour cream, and French onion soup. Mix until everything is well-coated.

6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish. Spread it evenly, and then sprinkle the top with shredded mozzarella and Gruyère cheese.

7. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until the cheese is bubbly and golden brown.

8. Garnish: Remove from the oven and let it sit for 5 minutes before serving. Garnish with fresh parsley if desired.

These steps will guide you in creating a Creamy French Onion Chicken Pasta Bake that is both delicious and satisfying.