Prepare macaroni according to package directions in 3 qt saucepan. Add broccoli during last 4 min. of cooking time.
Drain macaroni and broccoli well in colander.
Heat butter in skillet over medium-high heat. Add chicken and cook until well browned, stirring often. Stir soup, milk, cheese, pepper and macaroni mixture into skillet.
Cook until mixture is hot and bubbling.
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