Preheat the oven to 350°F.

Place the shredded chicken, broccoli, cream of chicken soup, cheddar cheese, garlic powder, salt, and pepper in large mixing bowl and mix well to combine. Transfer the mixture to a 9x13-inch baking dish and spread it into an even layer.

Spread the shredded cheese evenly over the casserole.

Bake the casserole on middle rack of oven until the cheese is melted and bubbly, 25-30 minutes.

Check to see that casserole is done. Remove from oven or add time as needed.

Allow the casserole to cool for 5-10 minutes before serving.