In a large mixing bowl, combine the cooked rice, shredded chicken, broccoli florets, sharp cheddar cheese, cream of mushroom soup, and milk. Sprinkle in the garlic powder, onion powder, black pepper, and salt. Stir thoroughly until every ingredient is well incorporated.
Lightly grease a 9x13 inch casserole dish with 1 tablespoon of olive oil. Spoon the mixture into the prepared dish, spreading it out evenly.
In a small bowl, combine the remaining tablespoon of olive oil with the breadcrumbs and grated Parmesan cheese. Mix well and sprinkle it evenly over the top of the casserole.
Bake in the preheated oven for 30-35 minutes, or until the casserole is bubbling and the topping is golden brown.
Allow the casserole to cool for about 5 minutes before serving.
Notes
Serve directly from the dish or in individual bowls, garnished with extra cheese and broccoli florets.