Begin by boiling a large pot of salted water. Once the water is boiling, add the rotini pasta and cook according to package instructions until al dente. Drain the pasta and set it aside to cool slightly.
In a large mixing bowl, combine the shredded chicken, creamy Caesar dressing, chicken broth, and chopped green onions. Stir until everything is well mixed.
Add the cooked rotini pasta to the chicken mixture. Gently fold the pasta into the mixture until it's evenly coated with the dressing.
Preheat your oven to 350°F (175°C). Transfer the pasta and chicken mixture into a 9x13 inch baking dish. Spread it out evenly.
Sprinkle the coarsely crushed Caesar flavored croutons and grated Parmesan cheese on top of the casserole. This will create a beautiful, crispy crust once baked.
Place the casserole in the preheated oven and bake for 25-30 minutes, or until the top is golden brown and the casserole is heated through.
Once baked, allow the casserole to cool for a few minutes before serving. Garnish with additional green onions if desired, and enjoy the delightful flavors of your Chicken Caesar Pasta Casserole!