Creating Best Chicken Nugget Casserole is simple if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook Nuggets: Bake the frozen chicken nuggets according to package directions until golden brown and crispy. Remove from oven and set aside.
3. Prepare the Casserole Mixture: In a large mixing bowl, combine the cream of chicken soup, milk, garlic powder, onion powder, salt, and pepper. Mix until smooth.
4. Add Vegetables: Stir in the frozen mixed vegetables and half of the shredded cheese. Mix well to combine.
5. Layer Ingredients: In a greased 9×13-inch baking dish, layer the cooked chicken nuggets evenly across the bottom. Pour the vegetable and soup mixture over the nuggets, spreading it out evenly.
6. Add Cheese: Sprinkle the remaining shredded cheese over the top of the casserole.
7. Prepare Topping: In a small bowl, combine the crushed cornflakes or breadcrumbs with melted butter. Mix until the crumbs are well-coated.
8. Top the Casserole: Sprinkle the buttered cornflakes or breadcrumbs evenly over the cheese layer.
9. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until the cheese is bubbly and the topping is golden brown.
10. Serve: Remove from the oven and let it cool for a few minutes before serving.

By following these steps, you can create a delicious Best Chicken Nugget Casserole that will impress everyone at your table.