1In large microwavable bowl, place cereal.
2In 1-cup microwavable measuring cup, microwave butter, mustard, honey and salt uncovered on High 30 to 40 seconds or until butter is melted and mixture is hot; stir.
3Pour over cereal, stirring until evenly coated. Microwave uncovered on High 3 to 4 minutes, stirring after every minute. Sprinkle salt over hot cereal.
4Spread on waxed paper or foil to cool. When mixture is cool, stir in ham and cheese. Store covered in refrigerator.