Creating a mouthwatering Chicken Casserole is straightforward if you follow these simple steps:

1. Preheat the Oven: Set your oven to 350°F (175°C) to preheat while you prepare the ingredients.
2. Sauté Vegetables: Heat olive oil in a skillet over medium heat. Add mixed vegetables and sauté for about 5 minutes.
3. Mix Ingredients: In a large bowl, combine the shredded chicken, sautéed vegetables, cream of chicken soup, sour cream, garlic powder, onion powder, salt, and pepper. Stir until well mixed.
4. Add Cheese: Gently fold in half of the shredded cheddar cheese into the mixture, reserving the other half for topping.
5. Transfer to Casserole Dish: Pour the mixture into a greased 9×13 inch baking dish, spreading it evenly.
6. Prepare Topping: In a small bowl, mix the crushed cornflakes (or breadcrumbs) with remaining cheddar cheese. Sprinkle this mixture evenly over the top of the casserole.
7. Bake: Place the casserole in the preheated oven and bake for 30 to 40 minutes, or until everything is heated through and the topping is golden brown.
8. Garnish: Once out of the oven, let it cool slightly. Garnish with chopped parsley before serving.

These easy steps will lead you to an incredible Chicken Casserole that’s sure to impress!