Preheat oven to 350
In a medium bowl combine flour, baking powder, baking soda and salt-set aside
In a large bowl, cream together butter and sugar
Mix in eggs, one at a time, combining well after each
Add in yogurt, vanilla and bananas.
Slowly mix in dry ingredients and stir just until incorporated.
Fold in blueberries.
Pour batter into a greased loaf pan.
Bake for 45-50 minutes until toothpick inserted in center comes out clean