Preheat your oven to 350°F (175°C).
Grease a 9x13-inch baking dish with cooking spray or butter.
In a large pot, bring water to a boil and blanch the broccoli florets for 2-3 minutes.
Drain the broccoli and set aside to cool slightly.
In a mixing bowl, combine the cream of mushroom soup, milk, garlic powder, salt, and pepper.
Add the cooked rice and mix well to combine.
Fold in the blanched broccoli and half of the cheddar cheese.
Pour the mixture into the prepared baking dish and spread evenly.
In a separate bowl, combine crushed crackers with melted butter and Parmesan cheese.
Sprinkle the cracker mixture evenly over the casserole.
Bake in the preheated oven for 25-30 minutes, or until bubbly and golden brown.