Preheat oven to 450 F/205 C, with a rack in the center. Line the muffin tin with papers. In a large bowl, combine the flours, sugar, salt, baking sode, and baking powder. In another bowl combine the bananas, buttermilk, eggs, vanilla, and butter. Stir until blended and uniform. Gentley stir the berries into dry ingridents. Pour the wet ingridents over dry, and mix until just combined. Fill the muffin tins 2/3 full, sprinkle with more berries and a generous dusting of cinnamon sugar. Bake for 25-40 minutes.