Preheat oven to 350°F. Mash bananas until almost smooth. Soften margarine and add to mashed bananas. Mix in eggs, vanilla, salt, pumpkin pie spice and sugar. In a separate bowl, combine flour and baking soda. Pour banana mixture into the dry ingredients and mix until mostly smooth. Pour into loaf pan (greased works best) and bake at 350°F for 45-50 minutes.
