Step 1

Preheat the oven to 350 degrees F. Line a 9X5-inch loaf pan with parchment paper and lightly grease with cooking spray (I cut a strip of parchment paper and line the bottom and two long sides). Set aside.

Step 2

In a large bowl, whisk together the bananas, sourdough starter, oil, brown sugar, granulated sugar, egg and vanilla until very well-combined.

Step 3

Add the flour, baking soda, baking powder, salt and cinnamon. Mix with a rubber spatula until just combined and no dry streaks remain. Don't over mix.

Step 4

Pour the batter into the prepared pan. Bake for 50-60 minutes until the top springs back lightly to the touch and a toothpick inserted in the center comes out clean.

Step 5

Remove the bread from the pan and let cool on a wire rack.