In large microwavable bowl, mix cereal, pretzels and crackers.
In small microwavable bowl, microwave butter uncovered on High about 30 seconds or until melted.
Pour over cereal mixture; stir until evenly coated.
Stir in dressing mix and cheese until evenly coated.
Microwave uncovered on High 3 minutes, stirring after each minute.
Spread on waxed paper or foil to cool.
Store in airtight container.
