Preheat oven to 350ยบ
Combine flour, baking powder, salt and baking soda in a large mixing bowl
In a separate bowl combine butter, sugar, eggs, milk, vanilla and mashed bananas and mix well
Stir banana mixture into flour mixture until you have a moist dough
Stir in chopped pecans
Pour mixture into a lightly greased loaf pan and bake for approximately 50 minutes.