If desired, crush cereal by placing in resealable food-storage plastic bag; seal bag and crush with rolling pin or meat mallet (or crush in food processor). In medium bowl, beat egg with wire whisk or fork. Beat in buttermilk, fat-free milk, oil and cereal; let stand about 5 minutes or until cereal is softened. Beat in remaining ingredients except blueberries. Gently stir in 1/2 cup blueberries.