Use very ripe bananas with brown spots for maximum sweetness and moisture; overripe bananas prevent the need for excess added sugar and create a denser, more flavorful crumb.

Mix cinnamon with brown sugar and a touch of avocado oil to create a paste, then swirl it through the batter in a figure-8 pattern halfway through pouring to prevent it from sinking to the bottom.

Fold the flour gently into the wet ingredients until just combined; overmixing develops gluten and creates a tough, dense texture instead of the tender crumb this bread requires.

Mix baking soda with a tablespoon of the milk before adding to the batter to activate it and ensure even rising and a lighter, more tender result throughout.

Insert a toothpick into the center (avoiding the cinnamon swirl) when the top is golden—it should emerge with just a few moist crumbs, not wet batter, indicating perfect doneness without over-drying.