Preheat the oven to 350°F (175°C).
Grease the inside of your loaf pan with ½ tablespoon cultured unsalted butter or vegetable oil. Be sure to get into the corners. Add 1 tablespoon granulated sugar and shake it around to coat the bottom and sides of the pan evenly.
½ tablespoon cultured unsalted butter, 1 tablespoon granulated sugar
Sift 325 grams all-purpose flour, 100 grams evaporated cane sugar, 1 teaspoon baking soda, and ½ teaspoon table salt into a bowl and whisk to combine.
325 grams all-purpose flour, 100 grams evaporated cane sugar, 1 teaspoon baking soda, ½ teaspoon table salt
Add 85 grams cultured unsalted butter to a microwave-safe bowl and heat it on low power until the butter is barely melted. Make sure you don't boil the butter.
85 grams cultured unsalted butter
Add 350 grams very ripe bananas, ½ cup plain yogurt, 2 large eggs, and 1 teaspoon vanilla extract to a blender (or use a bowl and stick blender and blend until smooth). You can also mash the bananas in a bowl and use a whisk to incorporate the other ingredients.
350 grams very ripe bananas, ½ cup plain yogurt, 2 large eggs, 1 teaspoon vanilla extract
With the blender running, pour the melted butter into the other wet ingredients and blend until smooth.
Pour the wet ingredients into the dry ingredients and fold the mixture together until it's mostly wet.
Add 160 grams chocolate chunks or chips and continue folding until there are no large clumps of flour. Be careful not to overmix the batter.
160 grams chocolate chunks
Dump the batter into the prepared loaf pan, and flatten off the top.
Bake for 50-60 minutes or until a skewer inserted into the center comes out without wet batter on it.
Transfer the loaf to a wire rack and cool until you can handle it without mitts. Remove the bread from the pan and let it cool to room temperature on the rack.