Gather all your ingredients on the counter. Shred your cooked chicken if you haven’t done so already. Measure out the broccoli florets and rice.
If starting with raw chicken, cook it by boiling, baking, or sautéing until fully cooked, about 15-20 minutes. Let it cool before shredding.
Prepare the broccoli by washing and cutting it into small florets. Steam for about 3-5 minutes until bright green and tender.
In a separate bowl, mix the cream of chicken soup, milk, garlic powder, onion powder, black pepper, and salt until well combined.
In a large mixing bowl, combine the shredded chicken, steamed broccoli, and cooked rice. Pour the cheese sauce over and stir gently until evenly coated.
Transfer the mixture into a greased 9x13-inch baking dish. If using breadcrumbs, mix with olive oil and sprinkle over the top. Add shredded cheddar cheese on top. Bake at 350°F for 25-30 minutes until bubbly and golden brown. Let cool for 5 minutes before serving.