In large microwavable bowl, mix cereal and walnuts; set aside.
In 2-cup microwavable measuring cup, microwave brown sugar, orange juice concentrate and oil uncovered on High 1 minute; stir. Microwave about 30 seconds longer or until mixture is hot; stir.
Pour over cereal mixture, stirring until evenly coated.
Microwave uncovered on High 5 minutes, stirring every 2 minutes. Stir in cranberries.
Spread on waxed paper or foil to cool. Store in airtight container.