Preheat the oven to 350ºF and spray a standard loaf pan with nonstick cooking spray or line it with parchment paper.
Whisk together the flour, baking soda, and salt in a large bowl. Set aside.
Add the cottage cheese to a high-speed food processor and blend until completely smooth. Set aside.
Next, add brown sugar and butter to a stand mixer and cream them together on low/medium.
Once creamed, add one egg at a time and beat on low/medium until they are combined with the butter and sugar.
In a medium bowl, use a fork to mash 3 bananas. Then add banana, cottage cheese, and vanilla to the stand mixer. Mix on low until all ingredients are combined.
Add the dry ingredients and mix to combine.
Finally, add the milk to the batter and mix until combined. The batter may be a bit lumpy and thick. That’s OK!
Transfer the banana bread batter to a lined loaf pan and bake at 350ºF for 30 minutes.
At 30 minutes, add a tin foil tent to the top of the banana bread to prevent the top from browning too quickly, and continue baking for an additional 25 minutes.
Remove the banana bread from the oven and let it sit for 10 minutes before removing it from the pan and placing it on a cooling rack.
Let banana bread cool completely before slicing and serving.