Prepare Bananas
Mash bananas with vanilla.
Combine Dry Ingredients
Combine flours, salt, baking powder, and baking soda. Keep cinnamon separate.
Mix Wet Ingredients
Whisk sour cream, eggs, and sugar. Stream in warm coconut oil.
Combine and Bake
Fold dry ingredients into wet ingredients in two additions.
Pour batter into a loaf pan.
Sprinkle cinnamon on top and swirl.
Bake at 175°C for 1 hour 10 minutes, rotating halfway.
Cool for 1 hour before unmolding.
