Step 1

Heat oven to 375°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Cook and drain macaroni as directed on package, using minimum cook time.

Step 2

In 5-quart Dutch oven, melt 4 tablespoons butter over medium heat. Beat in flour, onion salt, garlic salt and pepper with whisk until thickened. Cook 1 minute longer. Beat in milk. Heat to boiling over high heat, stirring frequently; boil and stir 1 minute. Remove from heat. Stir in 3 cups of the cheese until melted. Stir in macaroni, chicken and frozen broccoli. Pour into baking dish. Sprinkle remaining 1 cup cheese on top.

Step 3

In small bowl, mix bread crumbs and melted butter; stir until combined. Sprinkle over macaroni mixture.

Step 4

Bake 33 to 36 minutes or until mixture is bubbly (at least 165°F in center) and bread crumbs are browned.