Spray 9-inch square pan with cooking spray. In large bowl, mix cereal, cranberries, almonds and sunflower nuts.
In 2-quart saucepan, heat corn syrup, brown sugar and peanut butter to boiling over medium-high heat, stirring constantly. Boil and stir 1 minute. Remove from heat; stir in vanilla.
Pour syrup mixture over cereal mixture; toss to coat. Press firmly in pan. Cool completely, about 30 minutes. For bars, cut into 6 rows by 4 rows.