Preheat the oven to 325F. Spray a loaf pan with PAM cooking spray and set aside.
Sift together the flour, baking powder, baking soda, and salt into a large bowl.
Use a hand mixer or stand mixer to combine the ripe bananas, sugar, and oil in another large bowl. Add the eggs and mix quickly.
In a third large bowl, combine half of the dry ingredients, half of the wet ingredients, half of the milk, and half of the walnuts. Mix with the hand mixer until just combined. Add the remaining ingredients and mix again. Careful not to overmix the batter.
Pour into the loaf pan and bake for 1 hour. Test with a toothpick in the center of the loaf. If it comes out clean, the bread is done. If it comes out wet with batter, tent a piece of tinfoil over the top of the banana bread and allow to bake for 20 more minutes.
Remove from the oven and allow to cool in the loaf pan for another 20 minutes. Remove from the loaf pan and allow to cool on a wire rack until ready to slice and serve. Serve with a pad of butter if desired.
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