Preheat oven to 350ºF.
Grease a 9x5 loaf pan with coconut oil.
If solid, set aside 1/3 cup of coconut oil to soften at room temperature. (I will set this on the stove as the oven is warming up to soften it.)
Mix the dry ingredients (flour, brown sugar, baking powder, baking soda, salt, cinnamon) together in a large bowl. Use your fingers to flatten any brown sugar lumps in the mix.
In a separate bowl, peel and mash the overripe bananas with a fork until mostly liquid. Leave as many chunks as you want.
Add the other wet ingredients (coconut oil, vanilla) to the bananas.
Pour the wet ingredients into the dry. Use a spatula or wooden spoon to combine until mixed. Don't over-mix.
Pour the batter into the greased loaf pan. Optional: use a spatula or spoon to even out the top for a more even rise.
Optional: sprinkle some brown sugar on top of the batter before placing in oven.
Bake for 50 minutes at 350ºF, or longer if a more browned top is desired.
Allow loaf to cool for at least 10-15 minutes before slicing.
Sliced bread can be stored in the freezer for up to a few months. To thaw, transfer to fridge the night before consuming.