In large bowl, stir together flour, cereal, sugar, and baking soda.  Stir in blueberries.  Add flax seeds if desired.  In another bowl, whisk together bananas, eggs, and oil.  Using wooden spoon, stir banana mixture into flour mixture.  Do not over mix.  Spoon into greased baking pan.  Bake at 350̊ for 50-55 minutes, or until tester inserted into centre comes out clean.  Cool in pan for 10 minutes.  Transfer to wire rack to cool completely.