In a large bowl, mash bananas until only small chunks remain. Add in melted (and cooled) butter and brown sugar and stir until well combined. Stir in beaten eggs and vanilla and stir until well combined.
Add in dry ingredients, and stir until just combined. DO NOT OVER MIX. If desired fold in chopped nuts or chocolate chips.
Pour batter into prepared loaf pan.
Bake for approximately 50-60minutes or until a toothpick inserted into the center of a muffin comes out clean, center is starting to feel solid, and springs back when touched.
Remove from oven and allow to cool in bread pan on a wire rack for 10-15 minutes. Remove from bread pan to serve.
To save remaining bread, wrap tightly with plastic wrap, then foil and store in the refrigerator.
Make sure to read through the post to find great tips and tricks that will help you make the best banana bread from scratch!