Preheat your oven to 375°F. Lightly grease a 9x13 inch casserole dish. This helps prevent sticking and makes serving easier later. Set the dish aside while you prepare the mixture.

Wash and cut the broccoli into small florets. Steam them for about 3 to 4 minutes until slightly tender but still bright green. Do not overcook, as they will cook more in the oven.

In a large mixing bowl, combine cooked chicken, cooked rice, and steamed broccoli. Stir gently so everything mixes evenly. This forms the hearty base of your casserole.

In a separate bowl, mix cream of chicken soup, milk, garlic powder, onion powder, salt, and black pepper. Stir until smooth and creamy. This sauce brings everything together with rich flavor.

Pour the creamy sauce over the chicken, rice, and broccoli mixture. Add one cup of shredded cheese. Mix everything well until fully coated. The mixture should look creamy and evenly combined.

Pour the mixture into your prepared casserole dish. Spread it out evenly using a spatula. Make sure the surface is smooth so it cooks evenly and looks nice when baked.

In a small bowl, mix bread crumbs with melted butter. Sprinkle this mixture evenly over the casserole. Then add the remaining cheese on top for a golden, cheesy crust.

Place the dish in the preheated oven. Bake for 25 to 30 minutes until the top is golden and bubbly. Let it rest for 5 minutes before serving so it sets nicely.