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HEAT oven to 350°F.
COOK macaroni in large saucepan as directed on package, omitting salt and adding broccoli to the boiling water for the last 4 min.
MEANWHILE, melt butter in medium saucepan on medium heat. Add flour; cook and stir 1 min. or until bubbly. Gradually stir in milk. Bring to boil, stirring constantly; cook and stir 3 to 5 min. or until thickened. Add 1 cup cheddar and Parmesan; cook and stir 2 to 3 min. or until cheddar is melted.
DRAIN macaroni mixture. Add to sauce in skillet along with the ham; mix well. Spoon into 1-1/2-qt. casserole sprayed with cooking spray; top with remaining cheddar.
BAKE 20 min. or until heated through.