Preheat oven to 350°F.
Mash bananas in a small bowl using a fork until they’re pretty smooth.
In a large bowl, mix together flour, baking soda, and salt. Just stir it all together with a spoon until everything is well mixed.
Next, using a KitchenAid stand mixer or a handheld electric mixer, mix butter, sugars, and vanilla.
With mixer still turning, add eggs one at a time, then add bananas.
Again, with mixer turning, add dry ingredients to wet, and mix just until everything is moist. Do not overmix the batter. We want to keep it light and fluffy.
Pour batter into a greased 9 x 5 loaf pan and bake for 60 minutes or until a toothpick comes out mostly clean. As soon as a toothpick is mostly clean, take it out of the oven immediately. If overbaked, it can quickly become dense and heavy.
Flip the bread out of the loaf pan onto a cooling rack and let cool slightly before serving.