In large bowl, mix cereal, cranberries, sunflower nuts and cashews.
In 2-quart saucepan, mix brown sugar, corn syrup and peanut butter. Heat to boiling over medium-high heat, stirring constantly. Boil and stir 1 minute. Remove from heat; stir in vanilla.
Pour syrup over cereal mixture, stirring until evenly coated. Drop mixture by slightly less than 1/4 cupfuls onto waxed paper. Cool completely, about 30 minutes.