Add the baking soda to the yogurt in a larger cup or bowl. Set this aside.
Beat eggs, oil ,mashed bananas and sugar.
Combine the flour, bran, raisons and sunflower seeds. Add the yogurt/soda mixture to the egg, bananas, then add the flour. Put into paper-lined large muffin tins and bake at 400 degrees for 18 to 20 minutes.