Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the cooked rice and chopped broccoli.
Add the cream of mushroom soup and milk to the mixture.
Stir in the garlic powder, onion powder, salt, and pepper.
Mix in half of the shredded cheddar cheese.
Transfer the mixture to a greased baking dish.
Sprinkle the remaining cheddar cheese on top.
If desired, add breadcrumbs for a crunchy topping.
Bake in the preheated oven for 25-30 minutes, until bubbly and golden.
Let cool slightly before serving, and enjoy!