Preheat the oven to 350F. Lightly butter/grease a standard loaf pan and line with parchment paper.
In a large bowl, mash the bananas. Whisk in the olive oil, eggs and vanilla until combined. Use a rubber spatula to stir in the flour, cinnamon, baking soda, and salt. Transfer to the loaf pan and top with seeds, nuts, or chocolate chips (if using).
Bake for about 50 minutes, or until a toothpick, cake tester, or knife comes out clean.
Let cool for a bit, then slice and serve with plenty of butter, honey, and sea salt (if using).