01 -
Preheat oven to 350°F. Grease a standard loaf pan and gather all ingredients.
02 -
In a medium bowl, whisk together all-purpose flour, cocoa powder, baking soda, kosher salt, and espresso powder. Set aside.
03 -
In a separate bowl or stand mixer, combine olive oil, brown sugar, and granulated sugar. Mix on medium speed until smooth.
04 -
Add eggs one at a time, mixing after each addition and scraping down the bowl. Blend in vanilla extract and sour cream until just incorporated.
05 -
Fold mashed bananas into the wet mixture until evenly distributed.
06 -
Gently fold dry ingredients into wet ingredients, mixing until just combined. Do not overmix; a few streaks of flour are acceptable.
07 -
Reserve a handful of chocolate chips for topping. Toss remaining chocolate chips in 1 tablespoon of flour, shake off excess, and gently fold them into the batter.
08 -
Pour batter into the prepared loaf pan. Scatter reserved chocolate chips over the surface. Optionally, arrange banana slices lengthwise on top and press gently into the batter.
09 -
Bake at 350°F for 55–65 minutes, or until a toothpick inserted in the center emerges clean or with just a few moist crumbs. Remove from oven.
10 -
If desired, sprinkle 1 teaspoon granulated sugar over banana slices and caramelize with a kitchen torch until sugar melts and darkens.
11 -
Let bread cool in the pan for 20 minutes, then transfer to a rack to cool completely to room temperature. Slice and serve.