Preheat your oven to 350°F and grease a 9x5 inch loaf pan with butter or cooking spray, ensuring the bottom and sides are well coated to prevent sticking. While the oven preheats, mash your ripe bananas in a small bowl until completely smooth with no large lumps—this ensures even distribution throughout the bread and creates a tender crumb.
In a large mixing bowl, beat the softened butter and sugar together for 2-3 minutes until the mixture is light, fluffy, and pale in color. This creaming process incorporates air into the batter, which helps the bread rise and creates a tender texture. Make sure your eggs are at room temperature before proceeding to the next step, as they'll incorporate more smoothly into the creamed mixture.
Add the room temperature eggs one at a time to the creamed butter and sugar, beating well after each addition to fully incorporate. Pour in the mashed bananas from Step 1 and vanilla extract, stirring until the mixture is smooth and well combined. I like to use Kerrygold unsalted butter here because its higher fat content creates a richer, more tender crumb—and the bananas will add all the sweetness you need.
In a separate bowl, whisk together the flour, baking soda, salt, and cinnamon. Whisking these dry ingredients together ensures the baking soda and salt are evenly distributed throughout the flour, preventing any bitter pockets of baking soda in the final bread.
Pour the dry ingredient mixture from Step 4 into the wet ingredients from Step 3 and stir with a spatula until just combined—do not overmix. Overmixing develops gluten, which will make the bread tough and dense instead of tender and moist. The batter should look slightly lumpy and rough at this point.
Gently fold 1 cup of chocolate chips into the batter using a spatula with a few careful strokes. Pour the batter into your prepared pan and sprinkle the remaining 1/4 cup chocolate chips evenly over the top—these will create a delicious chocolate layer on the surface as the bread bakes. I prefer Ghirardelli semi-sweet chips because they hold their shape better and add a subtle texture contrast without making the bread overly sweet.
Bake at 350°F for 55-65 minutes, until a toothpick inserted into the center comes out with just a few moist crumbs (not wet batter). The bread should be golden brown on top. Remove from the oven and let rest in the pan for 10 minutes—this allows the structure to set and makes it much easier to turn out onto a cooling rack without breaking apart.