Set cheese sauce packet from dinner mix aside. Bring 6 cups water to a boil. Add macaroni; cook for 4 minutes. Add the broccoli, onion and garlic. Cook 3-6 minutes longer or until macaroni is tender; drain.
In a large saucepan, melt 1/2 cup butter. Stir in cheese sauce mix and milk. Add ham, mustard, salt and pepper. Stir in macaroni mixture.
Transfer to a greased broiler-proof 2-1/2-qt. baking dish. Melt remaining butter; toss with bread crumbs and Parmesan cheese. Sprinkle over top. Broil 4-6 inches from the heat for 4-5 minutes or until top is golden brown. Yield: 8 servings.