Preheat the oven to 350°F and line a loaf pan with parchment paper.
In a large bowl, mash the ripe bananas with a fork or potato masher.
Add the brown sugar and white sugar; whisk until combined.
Mix in the softened butter, eggs, vanilla, and sour cream, whisking until smooth.
Add the flour, cocoa powder, baking powder, and salt. Fold the dry ingredients into the wet with a rubber spatula until no flour streaks remain.
Gently fold in the chocolate chips.
Pour the batter into the prepared loaf pan and sprinkle with extra chocolate chips, if desired.
Bake for 55–60 minutes, or until a toothpick inserted comes out with slightly moist crumbs.
Let the loaf cool completely, then remove from the pan, slice, and serve. Enjoy!
Notes
The riper the bananas, the better! Look for bananas with lots of brown spots—they’re sweeter and add extra moisture to the bread.
Spoon the flour into your measuring cup and level it off with a knife. Too much flour can make the bread dense instead of soft and tender.
When folding in the dry ingredients, mix just until no flour streaks remain. Overmixing can lead to a tougher loaf.
Use a toothpick to check the loaf — it should come out with slightly moist crumbs, not wet batter. This ensures the bread stays fudgy and moist.
Allow the bread to cool fully before slicing. This helps it hold its shape and makes it easier to cut into clean slices.
Wrap leftover slices in plastic wrap or foil and store at room temperature for up to 3 days. For longer storage, freeze slices individually and reheat as needed.