butter (for greasing the muffin cups or cupcake liners)
2 cups whole wheat pastry flour (see note)
1 1/2 teaspoons baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt
1/4 teaspoon ground ginger
1/4 teaspoon ground cinnamon
2 large eggs
1/2 cup maple syrup
1/2 cup firmly packed light brown sugar
1/3 cup whole or lowfat milk
1/4 cup canola oil
1/4 teaspoon pure vanilla extract
1 1/2 cups mashed very ripe bananas (about 4)
3/4 cup chopped walnuts