Creating the perfect Chicken Broccoli Rice Casserole is straightforward when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Chicken: If you haven’t already, cook and shred or dice the chicken. Set aside.
3. Cook Rice: Prepare the rice as per the package instructions if not using pre-cooked rice.
4. Blanch Broccoli: If using fresh broccoli, blanch the florets in boiling water for about 3 minutes. Drain and set aside.
5. Mix Ingredients: In a large mixing bowl, combine shredded chicken, cooked rice, broccoli florets, cream of chicken soup, cheddar cheese, milk, garlic powder, onion powder, salt, and pepper. Stir until well combined.
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish and spread it evenly.
7. Prepare Topping (Optional): If using, combine breadcrumbs with olive oil or melted butter in a small bowl. Mix until the breadcrumbs are coated.
8. Top Casserole: Sprinkle breadcrumbs evenly over the top of the casserole for added crunch.
9. Bake: Place the casserole in the preheated oven and bake for 45-50 minutes, or until bubbly and golden on top.
10. Cool and Serve: Remove from oven and let it cool for about 5-10 minutes before serving. This allows the casserole to set a bit.