Ingredients
Equipment
Method
Prep the pan and oven
- Preheat the oven to 350°F and grease a 9x5 loaf pan.
- Line a sheet pan with parchment if you want easier cleanup when the loaf bakes.
Make the banana batter
- Mash 2 bananas, then stir in cooled brown butter, brown sugar, egg, vanilla, and espresso powder until smooth.
- Stir in baking soda and salt, then fold in all-purpose flour until just combined, with no dry streaks.
Create the dark swirl
- Remove half the batter to a separate bowl, then mix in dark cocoa powder until evenly colored.
- Alternate spoonfuls of plain and chocolate batter in the loaf pan, then swirl with a knife for a marbled pattern.
Top and bake
- Press the banana halves flat-side up on top, add chocolate chips, and bake for 55–65 min until a tester comes out with moist crumbs.
- Drizzle salted caramel over the warm loaf so it melts slightly and runs down the sides.
Notes
Brown butter must cool before mixing so the batter stays smooth and the egg doesn’t scramble. For best texture, slice after the loaf cools to warm (about 20 minutes). Store covered at room temperature for up to 3 days or refrigerate up to 5 days; freeze wrapped slices for up to 2 months (thaw overnight in the fridge). If you want a lighter version, use milk chocolate chips instead of dark chocolate chips to soften the bitterness without changing the swirl method.
