Grease a 9x5-inch loaf pan with butter and line with parchment paper; set aside. Preheat oven to 350°F and place rack in the center.
In a blender, combine the bananas, cottage cheese, and eggs. Blend until smooth, about 15–20 seconds.
Pour the blended mixture into a large bowl. Whisk in the melted butter, vanilla extract, and sugar until fully combined.
In a medium bowl, whisk together the flour, baking soda, salt, and cinnamon.
Add the dry ingredients to the wet mixture and stir with a spatula until just combined—do not overmix.
Fold in the mini chocolate chips, reserving a few tablespoons for the top.
Pour the batter into the prepared loaf pan and spread evenly. Sprinkle the top with the reserved mini chocolate chips.
Bake for 45–55 minutes, or until golden brown and a toothpick inserted into the center comes out mostly clean with a few moist crumbs.
Let cool completely in the pan before removing and slicing.