Preheat your oven to 350F and line a loaf pan with parchment paper or lightly grease it with oil. Set aside for later.
Remove the peels from your bananas. Then, add the banana flesh to a large mixing bowl and mash with a pastry cutter or fork until soft with some chunks.
Next, add your wet ingredients to the bowl of bananas including the brown sugar, cane sugar, olive oil, oat milk, ground flaxseed, and vanilla. Whisk together until smooth.
Once mixed, add in the dry ingredients starting with the all-purpose flour and then layering the baking powder, cinnamon, baking soda, and salt on top.
Use a spatula to fold the dry ingredients into the wet. Mix together until you have a thick banana bread batter with no streaks of flour remaining.
Pour the banana bread batter into the prepped loaf pan and use a spatula to evenly spread it out in the pan.
If desired, add any toppings at this time. I chose to use a mix of rolled oats and brown sugar on top, but this is totally optional.
Add the banana bread to the oven and cook for 50-52 minutes until cooked throughout and browned on top.
Remove from the oven and let cool in the loaf pan for at least 5 minutes. Then, transfer to a wire rack to finish cooling. Once cooled, slice and enjoy!