Sweet Crunch Mix

In a Large microwave-safe bowl, combine cereals, popcorn, peanuts and pretzels; set aside. In a medium microwave-safe bowl, combine butter, sugar, corn syrup, and flavor. Microwave on HIGH 2 minutes or until mixture is boiling, stirring after 1 minute. Pour over cereal mixture; stir until all pieces are evenly coated. Microwave on HIGH 5 to 6 minutes, stirring thoroughly with rubber spatula every minute and scraping sides and bottom of bowl. Spread on wax paper to cool; stir occasionally to break up.  Store in airtight container.