1. Heat butter in a 3-quart saucepan over medium heat. Add ham and onions; cook 5 minutes, stirring occasionally, until onions are softened and ham is lightly browned.
2. Meanwhile, microwave the frozen macaroni and cheese according to package directions.
3. Add macaroni and cheese, broth, corn, milk, salt, and pepper to the onions; bring to a boil. Stir in chicken; reduce heat. Cover and simmer 3 to 4 minutes, until chicken is cooked through. Garnish with chives. Serve with crusty bread, if desired. Makes 4 servings.