Start by preheating your oven to 350°F. Coat a 9×5-inch loaf pan with non-stick spray or line it with parchment paper for easy removal.
In a large bowl, whisk together the egg, light brown sugar, olive or coconut oil, cane sugar, Greek yogurt, and vanilla extract until smooth.
To the same bowl, add the flour, baking powder, baking soda, and sea salt. Gently fold the mixture until just combined. To the same bowl, add the flour, baking powder, baking soda, and sea salt. Gently fold the mixture until just combined.
Fold in the mashed bananas, mixing until just incorporated. Bananas not only add flavor but also natural sweetness and moisture.