Cover broccoli with water in a saucepan; bring to a boil over medium heat. Cook 5 minutes or until tender; drain.
In a large bowl, combine broccoli, chicken, soup, sour cream, garlic powder, onion powder and salt. Spread on a greased 8"x8" baking pan; sprinkle with cheese.
Mix together melted butter and bread crumbs; sprinkle over cheese. Bake, uncovered, at 450° for 15 minutes or until bubbly and golden.