1. Preheat Your Oven: First things first, preheat your oven to 375°F (190°C).
2. Cook the Pasta: Bring a large pot of salted water to a rolling boil. Add your chosen pasta and cook according to package directions until al dente. Drain the pasta thoroughly and set it aside.
3. Shred the Chicken: While the pasta cooks, shred the rotisserie chicken. Discard the skin and bones. Aim for about 3-4 cups of shredded chicken.
4. Prepare the Creamy Sauce: In a large mixing bowl, combine the two cans of condensed cream of chicken soup, sour cream, and milk. Whisk these ingredients together until the mixture is smooth.
5. Season the Sauce: Add the onion powder, garlic powder, dried parsley, salt, and black pepper to the sauce mixture. Stir everything together thoroughly.
6. Combine Ingredients: Add the shredded rotisserie chicken, cooked and drained pasta, and the frozen peas and carrots blend to the large bowl with the creamy sauce. Gently fold all the ingredients together until everything is evenly coated.
7. Add Cheese: Stir in 1 ½ cups of the shredded cheddar cheese into the mixture. Reserve the remaining ½ cup for topping.
8. Transfer to Baking Dish: Pour the entire mixture into a 9x13-inch baking dish and spread it evenly.
9. Top with Remaining Cheese: Sprinkle the remaining ½ cup of shredded cheddar cheese over the top of the casserole.
10. Bake to Perfection: Place the baking dish in the preheated oven. Bake for 25-30 minutes, or until the casserole is hot and bubbly and the cheese on top is melted and lightly golden.
11. Rest and Serve: Remove the casserole from the oven and let it rest for 5-10 minutes before serving. This allows the sauce to set slightly.