Adjust the oven rack to the lower third or middle position and preheat the oven to 350 degrees F. Line a 9x5-inch loaf pan with parchment paper, leaving a little overhang on the sides.
Combine the bananas, cottage cheese, maple syrup, eggs, and vanilla in a blender. Blend until smooth.
Stir in the melted and cooled butter.
Whisk the flour, baking soda, and cinnamon together.
Pour the liquid ingredients into the dry ingredients and stir just until combined. The batter will be thick!
Spoon half of the batter into the loaf pan.
Mix the ingredients for the cinnamon swirl together, then evenly pour over the batter in the loaf pan.
Top with the remaining batter and carefully spread it, being cautious not to move the cinnamon sugar mixture too much.
Use a knife to swirl the batter down the center (but avoid overdoing it as it could mix the layers a bit too much).
Bake for 60-65 minutes, covering halfway to keep from over-browning on top.
To make the icing, blend the cottage cheese and maple syrup until smooth. Remove and set aside. I like to use a small blender cup for this!
Let the banana bread cool for 5-10 minutes in the pan, then remove and let it cool on a cooling rack for another 10 minutes.
Drizzle with the icing, slice, and enjoy!